Evidence that light has wave property as well as particle property
We talked about the phenomenon represents the particle property of light in the last report under the title of ‘Photon and Electron’ on 16 May.
For example, about quintillion RGB photon are emitted per second from the home lighting lamp. When the blue photons with high energy collide with object, skin, eyes, the electrons from the surface or epidermis are emitted. It can be explained through the particle property of light.
In this report, I demonstrate that the light has wave property as well as particle property. To do this, let's see what happens when light passes through a double slit by diffraction and interference.
First, let's briefly discuss diffraction and interference.
Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle or aperture.
Interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower amplitude.
Though all wave such as light, sound, and water wave has the property of diffraction and interference, diffraction and interference of water wave are easily seen from nature.

Now let's see what happens when light passes through the double slit. Figure 3 shows what happens when light passes through a double slit. Since light passed through a double slit, there must be two patterns, but there are more patterns strangely.
This is because after the light passes through the double slit, diffraction and interference phenomena happens like the water waves in the two figures above.    

SungSoo Kim Ph.D
Physicist
* Next week’s topic: Effect of Artificial Lighting on Insects

You can find "Interesting Story about Light Science” series on the link below. 
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