REFRACTION OF LIGHT AT PLANE SURFACES - Telugu
Channel: Little Science Experiments
Date: 2020-05-24

What is Refraction of Light? 
          Refraction is the bending of light when it travels from one medium to another medium. Refraction is caused by the change in speed of light. 
In the beginning of the video, we show a Magic trick based on refraction! We discuss the different cases of refraction of light in detail: When light travels from a denser to a rarer medium and from a rarer to a denser material. Also when light is incident normally on a medium.
In Second Activity :
          Refraction of light explained through cup water and coin - 
You'll need: 
• Paper cup or any ordinary cup
• Coin
• Water 
PROCEDURE
• Place the coin in the middle of the paper cup.
• We observe that we can't see the coin from backwards.
• Now slowly start pouring some water till certain limit.
• Now move little backwards and observe now.
• Slowly pour more water and see the coin from where you are standing.
• We can see the coin.

EXPLANATION: 
When the paper cup is full the light bends over the edge so you can see the coin.  This is the light bends when it travels one transparent medium to other. This bending of light when it travels from one medium to another is known as refractive index. 
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