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Question

A ray of light travelling from medium I in which speed of light is 2×108 m/s to a medium II in which speed of light is 1.5×108 m/s. Choose the correct ray diagram:

I. u=2×108 m/s

II. v=1.5×108 m/s


A

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B

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C

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D

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Solution

The correct option is D


The speed of light is inversely proportional to the refractive index of the medium.
Given, the speed of light in medium I = u=2×108 m/s
The speed of light in medium II = v=1.5×108 m/s
Since u>v, so medium I is optically rarer medium than medium II.
When a ray of light passes from rarer to a denser medium it bends towards normal.


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