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Question

State whether light slows down or speeds up in the following cases:
(a) Light going from air to glass.
(b) Light going from glass to water.
(c) Light going from water to air.


Solution

Velocity of light in a medium $$V=\dfrac{c}{\mu}$$.    Where $$\mu=$$ Reflective index of medium.
Hence, Light passes from rare medium to denser medium, it’s velocity goes down.

Therefore
(a) Slows down 
(b) Speeds up 
(c) Speeds up 

Physics

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