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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