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A Light Ray in Passing from Water to a Medium (A) Speeds up (B) Slows Down. in Each Case, Give One Example of the Medium. - Physics

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Question

A light ray in passing from water to a medium

(a) speeds up

(b) slows down. In each case, give one example of the medium. 

One Line Answer
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Solution

When the speed increases it means that the refractive index of the medium is less than that of water.

When the speed decreases it means that the refractive index of the medium is greater than that of water.

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