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.

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Solution

Velocity of light in a medium $V = \frac{c}{μ}$ . Where $μ =$ 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

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(a)

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(b)

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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.

Velocity of light in a medium V=cμ. Where μ= 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

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.

Velocity of light in a medium $V = \frac{c}{μ}$ . Where $μ =$ 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