Three Line Tales – Beacon

We move forward…

Many thanks to Sonya for Week Two Hundred and Sixty of Three Line Tales, part of her awesome blog Only 100 Words!

three line tales, week 260: illuminated Fernsehturm top of the Berlin
photo by Jonny Caspari via Unsplash

Out of darkness comes,
Beckoning us to approach,
Light, beacon of hope!


Thank you to Sonya of Only 100 Words for coming up with Three Line Tales.

You’ll find full guidelines on her TLT page, but here’s the tl;dr:

  • Write three lines inspired by the photo prompt (& give them a title if possible).
  • Link back to this post.
  • Tag your post with 3LineTales (so everyone can find you in the Reader).
  • Read and comment on other TLT participants’ lines.
  • NEW: If you want your post to be included in the round-up, you have until Sunday evening to publish it.
  • Have fun.

Happy three-lining and Halloween!

Three Line Tales – Prismatic

Find the pot of gold!

Many thanks to Sonya for Week One Hundred and Ninety-Two of Three Line Tales, part of her awesome blog Only 100 Words!

three line tales, week 192: a rainbow over a plaza
photo by Sara Riaño via Unsplash

Speed of light, breaking,
Waves of color, bending sky.
Leprechauns abound!


Thank you to Sonya of Only 100 Words for coming up with Three Line Tales.

You’ll find full guidelines on her TLT page, but here’s the tl;dr:

  • Write three lines inspired by the photo prompt (& give them a title if possible).
  • Link back to this post.
  • Tag your post with 3LineTales (so everyone can find you in the Reader).
  • Read and comment on other TLT participants’ lines.
  • NEW: If you want your post to be included in the round-up, you have until Sunday evening to publish it.
  • Have fun.

Happy three-lining!

Tuesday Photo Challenge – Round Up 126

The light shines bright!

Welcome to the 126th round up of the Tuesday Photo Challenge!

Your contributions for this past week’s theme of Light and Dark were absolutely stunning!  It was a great deal of fun both to view the wonderful photos and great stories that come with these photos!  The juxtaposition of light and dark makes for amazing possibilities, and as you explored them, your creative minds and eyes found treasures along the way!

Thank you for a stunning set of contributions!!  I appreciate it!

Here’s a different view between light and dark…


This image comes from a night shoot, where I explored zoom blur and rotation techniques to come up with a scene that played across many dimensions, as energies transition from one to the next…

The following were this week’s participants in the challenge with links to their posts:

  1. Sarah’s entry in By Sarah captures a truly dramatic set of images of her and her husband! [N.B. – blog may be set to private]
  2. In another awesome post in A Pause for Nature, we get a playful view of shadows, as they are juxtaposed to light!  In a second post in A Pause for Nature, we get treated to more great images; love the shadow photo!
  3. Shelley’s post in Quaint Revival shares great ideas on how to simplify blog topics amidst a wonderful array of photos that highlight light and dark!
  4. Xenia’s post in whippetwisdom takes us along the sacred path, filled with wonderful light and shadows!  In a second post in Tranature we get to see the curlew stepping along the shore in its calm manner; lovely images!
  5. Kammie’s post in The Nut House shares some wonderful images with lots of interesting interplay between light and shadow!
  6. The fantastic photo in Land of Images provides a gorgeous view of light and dark in the sky!
  7. Nicole’s photo in her lovely blog Une Photo, Un Poéme presents a great interplay of light that is sure to delight all!
  8. Brian’s image of the sky is extremely impressive, as you can see in Bushboy’s World;  its combination of light and dark is stunning!  Brian also shares a wonderful photo in his second post in Bushboy’s World, where the light creates a stunning display!
  9. Very delicious is the key aspect of pensivity101‘s lovely post, where we should make a choice between light and dark…
  10. In Sync with Deep‘s lovely post, we find a light shining in the dark with a superb poem!
  11. Petra explores the light and the dark in her post in Photoworld vol. 3, which is much appreciated by the dogs being walked and us, as the light is gorgeous!
  12. In a very creative post in her blog Out of my Write Mind, Sandy casts a magical shadow…it wasn’t easy to get that shot!
  13. In a great post in her blog Heaven’s Sunshine, Irene shares a wonderful photo of sunlight being framed by dark clouds.
  14. A stunning photo will regale you in Chateaux des Fleurs, as light plays across the most delicate of structures…
  15. A beautiful set of images in MyTravelCSP are shared by Prasath; the location looks somewhat familiar to me, so where do you think it is?
  16. Ramya’s post in And Miles to Go before I Sleep glows with the power of Lord Ganesh, literally!
  17. The photo in Na’ama Yehuda‘s entry is inviting us to wait for sunrise with our friends, as it is sure to be stunning!
  18. This week’s post in One letter UP – diary 2.0 takes us to an oasis on the East Coast! A truly special location to relax amidst chaos!
  19. In a lovely post in A Day in the Life, we get to see the interaction of light and dark in a number of great photos!
  20. In a truly interesting post in stephentotheplate, Marie creates a vision in words that takes the theme image to the next level!
  21. In TravelWays, we get another view of the scene of a museum worker posing by a window for an interesting interplay of light and dark.
  22. Robert certainly knows how to capture both the light and dark in Photo Roberts Blog, as his photos are amazing!
  23. Khürt’s post in Island in the Net provides an interesting view into an American ritual of Friday nights!  Go check out his amazing photography! Khürt also shares another stunning photo in Island in the Net, which you have to see as well!
  24. Jason has them sticking their neck our in Proscenium, which definitely shows their curiosity!
  25. In Don’t Hold Your Breath, we get the author’s view of the simple life… definitely a great life from my perspective!
  26. It definitely wasn’t easy to capture the photo in theOnlyD800intheHameau, but it was worth it to get the great photo in the Abbey of Noirlac!
  27. Stella creates another great post in Giggles & Tales, where we get a beautiful interpretation of this week’s theme!
  28. In an excellent post in WhatAmberThinks, we get treated to lovely photos with stunning vistas!
  29. Debbie writes a wonderful post in Forgivingconnects, as she is moving and also in a second post in Forgivingconnects, we find out that Debbie is going to be spending some great time on vacation!  Have fun and share photos!
  30. Olga shares some great explorations of light and dark in her post in Stuff and what if…; those shadows may be moving!
  31. Maria’s post in Kamerapromenader captures a beam of early morning light, as it plays across a flower or two!
  32. Cee’s post in Cee’s Photography is filled with wonderful photos that play with light and dark!
  33. Judy’s lovely post in lifelessons features an impressive array of photos that play with shadows and light!
  34. Debbie’s photo in Travel with Intent is simply stunning!  Filled with leading lines and the beauty of architecture, it makes one want to visit Nimes!
  35. In an interesting post in Light Motifs II, we are treated to cool photos that play with the light and record its effect!
  36. The shot in Expressed Digitally is a perfect interpretation of the theme, and I like mine dark!
  37. The photos in the entry in Hadd Hai Yaar are beautifully executed and really fit the theme
  38. Hammad went high in his post in the Blog of Hammad Rais, as he looked up to the sky to get great shots of light and dark!
  39. In another awesome post in WoollyMuses, we go for a drive to Geelong to find just the right amount of light and dark!
  40. In a beautiful post in underdown, we visit Leeuwin’s Lighthouse, where light and dark are expertly captured!
  41. In GiftSmart, Tatiana shares a lovely photo that catches some amazing light!
  42. Susan captures a gorgeous set of flowers in her post in Musin’ with Susan, where the light provides just the right amound of shadow!
  43. In Banactee we find an amazing photo that brings a lot of dark into view with just the right amount of light!
  44. Sonya takes us into the Gorges Loop in Middleton Road; this is a fantastic location!
  45. Sonia’s post in Sonia’s Musings explores the light, as it plays across the furniture; wonderful photo!
  46. In sgeoil‘s post, light and shadows play to create a wonderful still life!

I hope that you enjoy these posts and let the authors know!

Three Line Tales – Lightness of Being

Entirely bearable!

Many thanks to Sonya for Week Ninety-Two of Three Line Tales, part of her awesome blog Only 100 Words!

three line tales week 92: shadow people in a see of reddish light

photo by gn dim via Unsplash


Floating through a sea,
Photons embrace our essence.
Lightness of Being!


Thank you to Sonya of Only 100 Words for coming up with Three Line Tales.

You’ll find full guidelines on her TLT page, but here’s the tl;dr:

  • Write three lines inspired by the photo prompt (& give them a title if possible).
  • Link back to this post.
  • Tag your post with 3LineTales (so everyone can find you in the Reader).
  • Read and comment on other TLT participants’ lines.
  • NEW: If you want your post to be included in the round-up, you have until Sunday evening to publish it.
  • Have fun.

Happy three-lining!

Three Line Tales – Glowing

Follow the lights!

Many thanks to Sonya for Week Sixty-Four of Three Line Tales part of her awesome blog Only 100 Words!

three line tales week 64: light bulbs – there is a light that never goes out, maybe
photo by Nick de Partee via Unsplash


Glowing filament,
Encased in glass, noble gas.
Incandescent guide


Thank you to Sonya of Only 100 Words for coming up with Three Line Tales.

You’ll find full guidelines on her TLT page, but here’s the tl;dr:

  • Write three lines inspired by the photo prompt (& give them a title if possible).
  • Link back to this post.
  • Tag your post with 3LineTales (so everyone can find you in the Reader).
  • Read and comment on other TLT participants’ lines.
  • NEW: If you want your post to be included in the round-up, you have until Sunday evening to publish it.
  • Have fun.

Happy three-lining!

Tuesday Photo Challenge – Round Up 36

Light shone everywhere!

On this Boxing Day, it is already time for the 36th collection Tuesday Photo Challenge entries, which clearly saw the Light!  I hope that everyone had a great start to their Holidays, as the Season continues and we’re looking forward to the New Year in 2017 with anticipation.


There were a great number of contributions to this week’s challenge, including first-time entries, and, as usual, the quality was fantastic!  All of you really put your best lens forward!

Here’s another look at some of the holiday lights at Tower Hill Botanic Garden:

Lighting Up the Systematic Garden

The following were this week’s participants in the challenge with links to their posts:

  • Judith led the proceedings off with a great post in Nature Knows Best, in which there were lights of all sizes and purposes.
  • Michelle’s post in Southern By Design featured gorgeous photography, which you’ll need to check out!
  • Emily’s blog, Zombie Flamingoes showed some amazing lighting, which clearly took quite a bit of work.
  • In her post in Showers of Blessing, Miriam shares the gorgeous Christmas decorations done by her friend, who is on the mend from extended health issues.
  • Candace’s post in her blog Netdancer’s Musings and Photography shows us the lights on the Eiffel Tower, which makes for a beautiful image.
  • Marie captured the lights in Colmar, France, in her post in The New 3Rs: Retire, Recharge, Reconnect.
  • Leaking Ink‘s post about Karthikai Deepam is just gorgeous, as it highlights the lights of this festival.
  • The set of images in the post by Ladyleemanilla show us lots of different Winter lights in all their glory!
  • Misti’s contribution in Misti Layne shows the use of light in her lovely images of a wedding she photographed.
  • Nikki has great images of light in her new blog, Flying through Water, which is turning out stunning posts!
  • Not to be outdone by Nikki, Steve’s post in Steve Newcomb Photography puts a very Christmas’ spin on the theme; which one is better?  You decide.
  • Last, and definitely not least, is Debbie’s post in Forgiving Connects, where she brings the light from within; another great post!

A great list of responses to the challenge, which really bring the light out in this season of short days and long nights.

Tuesday Photo Challenge – Round Up 19

Light guided missives!

This week showcased a wonderful variety of light coming into play throughout this creative set of images.  I was blown away by the level of participation and cannot say enough about the quality of your posts!

In your exploration of the way light can be captured in your images, you showed a variety of light sources, ranging from the Sun to fire and candles, and treated each with the creativity that guided your eyes.  The images ranged across topics, but I’m sure you’ll agree after checking them all out that there were some real stunning images this week!  Well done!!

A little bit of bokeh at work through foliage in this image…

Verdant Shades

The following were this week’s participants in the challenge with links to their posts:

  • Out an’ About, written by Miriam, focused on the light provided by fire and the special meaning that fire has for us humans.
  • The Girl That Dreams Awake provided a gorgeous capture of votive candles.  Plus, she drew in another participant!  You pulled in Julie Powell – Photographer & Graphic Artist, who shared a great image of creating light in the woods.
  • LadyLeeManilla shows us a wonderful captures of light ranging from torch dancing to gentle lights in the skyline.
  • Michelle of Southern By Design provided a fantastic image of light filtering through a beautiful tree.
  • Emily’s Zombie Flamingos featured a trail of light scattering of the water; gorgeous!
  • Nature Knows Best, created by Judith, really caught my eye with a stunning composition of light reflecting of the water!
  • Sunshine’s Daily Blabber shared a wonderful sunrise with amazing colors!
  • Sayanthi was very playful in Close to You, contributing several images with different aspects of light.
  • Marga is a new participant with her post in The Photographer Smiled, where she captured light in a stunning manner.
  • Sonya’s Middleton Road contrasted a reflection in a puddle with light and shadows, most creative!
  • Steve, of Steve Newcomb Photography, shot a variety of light situations, taking us on a light trip!
  • Debbie, in Forgiving Journal, took a bit of poetic license by capturing kids’ Post-It notes as points of light.  All is forgiven 🙂
  • Nikki’s  A Kinder Way provides us with a range of light in some gorgeous photos!
  • A special mention this week to the lovely blog Grow Cook Eat Enjoy, whose author found our challenge.  Their entry was focused on vegetables, one of our earlier challenges, which all need light!  Welcome to the challenge!!

I hope that I got everyone’s posts! Go check out each other’s posts and enjoy the wonderful range of expressions that we find!

Now to switch my mind to the next challenge.  And, no, it’s not dark 🙂

Tuesday Photo Challenge – Light

Scatter and collect the light…

Welcome to the 19th episode in the on-going saga of the Tuesday Photo Challenge!  Last week’s roll-up of all the curves showcased some amazing photography, and was a tribute to all the creativity that runs rampant in you wonderful readers!

This week I wanted something a little different from what we’ve done before, in how we deal with a quintessential component of photography: Light.

As you well know, there is no image for us to capture without light, unless we’re looking to present a pure black canvas.  We use light, and shadow, to compose a scene for the viewer, and often fall into a familiar pattern, where we avoid bright spots of light falling onto our film, be it digital or analog.  What I’m asking you to do this week, is that you use light to create bright elements, such as specular highlights or small reflective spots, in your composition to add to the quality of the image.

You’ll notice that these spots will draw the attention of the viewer to those areas of the image; you’ll want to use the spots to lead the viewer’s eye to your subject.  Too large a bright spot will not allow the eye to escape from the area and be led.  Be cautious and don’t overdo it, but also don’t be bashful!

Here’s an image that I captured at Tower Hill Botanic Garden.

Path of Light

This image has a bit of a different look, as I used a zone-plate lens, which causes subtle diffraction patterns, thus providing a very soft focus and dream-like quality.

Go play with light, find some reflections, bright little spots filtering through leaves, or whatever catches your eye, and, most of all, have fun!!!

For those who’d like to participate in this weekly challenge, the rules are the following:

  • Write a post with an image for this week’s topic
  • Please tag your post with fpj-photo-challenge (if you’re not sure about how tags work, please check out this WordPress article about tagging posts)
  • Create a pingback link to this post, so that I can create a post showing all of the submissions over the week
  • Have fun creating something new (or sharing something old)!!

I expect this challenge to provide some interesting imagery, as light is essential to our existence!

Technical Details

This image was captured with a Canon 5D MkIII using a Lensbaby zone-plate lens.  This lens has a fixed f-stop of f/19 and was used at 1/160 second and 400 ISO.

Wednesday Wonderment – Ep. 28

A light subject

As a photographer, even beyond the wonderful things that we can see in the world around us, there is one aspect, without which we cannot work.  The amazing part of photography, which never ceases to fill me with wonderment: Light!

Light is a very interesting and rather complex entity.  As visible light is made up of light of many frequencies, the exact blend of these frequencies, or colors, determines the quality of light; in photography, the quality of light is important in helping set the tone of an image.  You may have heard about the ‘golden hour’, which is a period of the day when light has a warm quality (i.e. more reddish hues), which can lend beautiful tonality to a landscape or portrait.

An example of warm light is this image from about 12 years ago, where the combination of color and light provide for a richly colored image.

Geese on the Quinapoxet

Light quality to a photographer is a blend of color (temperature), diffused vs directional (soft vs hard) and direction; these factors help determine the overall look of an image.  As a physicist, what we have learned about light over the centuries is an interesting story.

History of Theories about Light

In the fifth century BC, Empedocles postulated that everything was composed of four elements; fire, air, earth and water. He believed that Aphrodite made the human eye out of the four elements and that she lit the fire in the eye which shone out from the eye making sight possible. If this were true, then one could see during the night just as well as during the day, so Empedocles postulated an interaction between rays from the eyes and rays from a source such as the sun.

In about 300 BC, Euclid wrote Optica, in which he studied the properties of light. Euclid postulated that light travelled in straight lines and he described the laws of reflection and studied them mathematically. He questioned that sight is the result of a beam from the eye, for he asks how one sees the stars immediately, if one closes one’s eyes, then opens them at night. Of course if the beam from the eye travels infinitely fast this is not a problem.

In 55 BC, Lucretius, a Roman who carried on the ideas of earlier Greek atomists, wrote:

The light & heat of the sun; these are composed of minute atoms which, when they are shoved off, lose no time in shooting right across the interspace of air in the direction imparted by the shove.” – On the nature of the Universe

Despite being similar to later particle theories, Lucretius’s views were not generally accepted.

Ptolemy (c. 2nd century) wrote about the refraction of light in his book Optics.

Classical India

In ancient India, the Hindu schools of Samkhya and Vaisheshika, from around the early centuries AD developed theories on light. According to the Samkhya school, light is one of the five fundamental “subtle” elements (tanmatra) out of which emerge the gross elements. The atomicity of these elements is not specifically mentioned and it appears that they were actually taken to be continuous. On the other hand, the Vaisheshika school gives an atomic theory of the physical world on the non-atomic ground of ether, space and time. (See Indian atomism.) The basic atoms are those of earth (prthivi), water (pani), fire (agni), and air (vayu) Light rays are taken to be a stream of high velocity of tejas (fire) atoms. The particles of light can exhibit different characteristics depending on the speed and the arrangements of the tejas atoms. The Vishnu Purana refers to sunlight as “the seven rays of the sun”.

The Indian Buddhists, such as Dignāga in the 5th century and Dharmakirti in the 7th century, developed a type of atomism that is a philosophy about reality being composed of atomic entities that are momentary flashes of light or energy. They viewed light as being an atomic entity equivalent to energy.


René Descartes (1596–1650) held that light was a mechanical property of the luminous body, rejecting the “forms” of Ibn al-Haytham and Witelo as well as the “species” of Bacon, Grosseteste, and Kepler. In 1637 he published a theory of the refraction of light that assumed, incorrectly, that light travelled faster in a denser medium than in a less dense medium. Descartes arrived at this conclusion by analogy with the behaviour of sound waves. Although Descartes was incorrect about the relative speeds, he was correct in assuming that light behaved like a wave and in concluding that refraction could be explained by the speed of light in different media.

Descartes is not the first to use the mechanical analogies but because he clearly asserts that light is only a mechanical property of the luminous body and the transmitting medium, Descartes’ theory of light is regarded as the start of modern physical optics.

Particle theory

Pierre Gassendi (1592–1655), an atomist, proposed a particle theory of light which was published posthumously in the 1660s. Isaac Newton studied Gassendi’s work at an early age, and preferred his view to Descartes’ theory of the plenum. He stated in his Hypothesis of Light of 1675 that light was composed of corpuscles (particles of matter) which were emitted in all directions from a source. One of Newton’s arguments against the wave nature of light was that waves were known to bend around obstacles, while light travelled only in straight lines. He did, however, explain the phenomenon of the diffraction of light (which had been observed by Francesco Grimaldi) by allowing that a light particle could create a localised wave in the aether.

Newton’s theory could be used to predict the reflection of light, but could only explain refraction by incorrectly assuming that light accelerated upon entering a denser medium because the gravitational pull was greater. Newton published the final version of his theory in his Opticks of 1704. His reputation helped the particle theory of light to hold sway during the 18th century. The particle theory of light led Laplace to argue that a body could be so massive that light could not escape from it. In other words, it would become what is now called a black hole. Laplace withdrew his suggestion later, after a wave theory of light became firmly established as the model for light (as has been explained, neither a particle or wave theory is fully correct). A translation of Newton’s essay on light appears in The large scale structure of space-time, by Stephen Hawking and George F. R. Ellis.

The fact that light could be polarized was for the first time qualitatively explained by Newton using the particle theory. Étienne-Louis Malus in 1810 created a mathematical particle theory of polarization. Jean-Baptiste Biot in 1812 showed that this theory explained all known phenomena of light polarization. At that time the polarization was considered as the proof of the particle theory.

Wave theory

To explain the origin of colors, Robert Hooke (1635-1703) developed a “pulse theory” and compared the spreading of light to that of waves in water in his 1665 work Micrographia (“Observation IX”). In 1672 Hooke suggested that light’s vibrations could be perpendicular to the direction of propagation. Christiaan Huygens (1629-1695) worked out a mathematical wave theory of light in 1678, and published it in his Treatise on light in 1690. He proposed that light was emitted in all directions as a series of waves in a medium called the Luminiferous ether. As waves are not affected by gravity, it was assumed that they slowed down upon entering a denser medium.

The wave theory predicted that light waves could interfere with each other like sound waves (as noted around 1800 by Thomas Young). Young showed by means of a diffraction experiment that light behaved as waves. He also proposed that different colours were caused by different wavelengths of light, and explained colour vision in terms of three-coloured receptors in the eye.

Another supporter of the wave theory was Leonhard Euler. He argued in Nova theoria lucis et colorum (1746) that diffraction could more easily be explained by a wave theory.

In 1816 André-Marie Ampère gave Augustin-Jean Fresnel an idea that the polarization of light can be explained by the wave theory if light were a transverse wave.

Later, Fresnel independently worked out his own wave theory of light, and presented it to the Académie des Sciences in 1817. Siméon Denis Poisson added to Fresnel’s mathematical work to produce a convincing argument in favour of the wave theory, helping to overturn Newton’s corpuscular theory. By the year 1821, Fresnel was able to show via mathematical methods that polarisation could be explained by the wave theory of light and only if light was entirely transverse, with no longitudinal vibration whatsoever.

The weakness of the wave theory was that light waves, like sound waves, would need a medium for transmission. The existence of the hypothetical substance luminiferous aether proposed by Huygens in 1678 was cast into strong doubt in the late nineteenth century by the Michelson–Morley experiment.

Newton’s corpuscular theory implied that light would travel faster in a denser medium, while the wave theory of Huygens and others implied the opposite. At that time, the speed of light could not be measured accurately enough to decide which theory was correct. The first to make a sufficiently accurate measurement was Léon Foucault, in 1850. His result supported the wave theory, and the classical particle theory was finally abandoned, only to partly re-emerge in the 20th century.

Electromagnetic theory as explanation for all types of visible light and all EM radiation

In 1845, Michael Faraday discovered that the plane of polarisation of linearly polarised light is rotated when the light rays travel along the magnetic field direction in the presence of a transparent dielectric, an effect now known as Faraday rotation. This was the first evidence that light was related to electromagnetism. In 1846 he speculated that light might be some form of disturbance propagating along magnetic field lines. Faraday proposed in 1847 that light was a high-frequency electromagnetic vibration, which could propagate even in the absence of a medium such as the ether.

Faraday’s work inspired James Clerk Maxwell to study electromagnetic radiation and light. Maxwell discovered that self-propagating electromagnetic waves would travel through space at a constant speed, which happened to be equal to the previously measured speed of light. From this, Maxwell concluded that light was a form of electromagnetic radiation: he first stated this result in 1862 in On Physical Lines of Force. In 1873, he published A Treatise on Electricity and Magnetism, which contained a full mathematical description of the behaviour of electric and magnetic fields, still known as Maxwell’s equations. Soon after, Heinrich Hertz confirmed Maxwell’s theory experimentally by generating and detecting radio waves in the laboratory, and demonstrating that these waves behaved exactly like visible light, exhibiting properties such as reflection, refraction, diffraction, and interference. Maxwell’s theory and Hertz’s experiments led directly to the development of modern radio, radar, television, electromagnetic imaging, and wireless communications.

In the quantum theory, photons are seen as wave packets of the waves described in the classical theory of Maxwell. The quantum theory was needed to explain effects even with visual light that Maxwell’s classical theory could not (such as spectral lines).

Quantum theory

In 1900 Max Planck, attempting to explain black body radiation suggested that although light was a wave, these waves could gain or lose energy only in finite amounts related to their frequency. Planck called these “lumps” of light energy “quanta” (from a Latin word for “how much”). In 1905, Albert Einstein used the idea of light quanta to explain the photoelectric effect, and suggested that these light quanta had a “real” existence. In 1923 Arthur Holly Compton showed that the wavelength shift seen when low intensity X-rays scattered from electrons (so called Compton scattering) could be explained by a particle-theory of X-rays, but not a wave theory. In 1926 Gilbert N. Lewis named these light quanta particles photons.

Eventually the modern theory of quantum mechanics came to picture light as (in some sense) both a particle and a wave, and (in another sense), as a phenomenon which is neither a particle nor a wave (which actually are macroscopic phenomena, such as baseballs or ocean waves). Instead, modern physics sees light as something that can be described sometimes with mathematics appropriate to one type of macroscopic metaphor (particles), and sometimes another macroscopic metaphor (water waves), but is actually something that cannot be fully imagined. As in the case for radio waves and the X-rays involved in Compton scattering, physicists have noted that electromagnetic radiation tends to behave more like a classical wave at lower frequencies, but more like a classical particle at higher frequencies, but never completely loses all qualities of one or the other. Visible light, which occupies a middle ground in frequency, can easily be shown in experiments to be describable using either a wave or particle model, or sometimes both.


Light is a multi-faceted entity, the control of which makes for a variety of possibilities, whether setting the mood in a room with specific light temperatures or createing a scene with a particular feel in a movie or photo.  The study of light opens doors to unlocking some of the secrets of effective photography, and is a lot of fun in helping us learn a bit more about the universe, in which we live.

Hopefully, this shines a light on your day!

photo roberts blog 2

ich zeige euch meine stadt wie ich sie sehe

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