History of Light
Shweta KatheriaMar 9, 2019 . 2 min read
This is 5th to 3rd BC era of ancient Greece. Many researchers through the ages have always wondered what is Light? That’s why optics has also been the oldest discipline along with mechanics. Here is the description of how research has evolved with time.
“The essence of light is white light.
Colors are made up of a mixture
of lightness and darkness.”
In the back, around 4th B.C. at the time of Aristotle laid the foundation of optics in Ancient Greece. And then Euclid (330–275 B.C.) summarized fundamental knowledge of optics, such as reflection, diffusion, and vision, into a book called “Optics”. At that time they described light as the white light and colors are made of lightness and darkness.
“Why does the moon appear larger near
the horizon than it does
when higher up in the sky ?”
At this time interval, observation on light reflection and refraction through mirrors and lenses, visual perception and light from the moon and stars, and the structure of space are made.
“Light is comprised of colored particles.”
This was the time of
“Light is a wave.”
During this same era, Christiaan Huygens published a paper on light advocating his theory that light is a wave or wavefront. He utilized this theory of light as a wave to explain light reflection and refraction phenomenon. But since he was opposing the theory of Newton (a great discoverer and scientist) that was the matter of heated discussion that time.
18th-19th Centuries :
“Proof of the wave theory of light”
Here comes the entry of Thomas Young(same person who worked on elasticity and has fundamental constant Young’s Modulus on his name). he showed that when light coming from a point light source is shined onto two pinholes, interference fringes can be observed on a screen an appropriate distance away (Young’s double slit Experiment) and advocated his theory that light behaves like a wave.
“Predicted the existence of electromagnetic waves”
Maxwell predicted the existence of electromagnetic waves, the fact that electromagnetic waves propagate at the same speed as light, and as horizontal waves. And we can see different types of light on this Electromagnetic spectrum.
20th century :
“Light is a photon”
Albert Einstein’s photoelectric experiment again changed the direction of Modern Physics. This experiment shows that light is made up of particles called photons, which earned him the Nobel Prize in physics.
The photon has many mysterious physical properties such as possessing the dual properties of a wave and a particle. Revealing facts of these properties may lead us to use light more effectively than ever before. The photon is a substance that is seen as the key to the origins of space and life. For human beings, the history of light and optics research may have only just begun.
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