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Question

The transparent media of refractive indices 1.2, n, n′ respectively, are stacked as shown. A ray of light follows the path shown. Then,

A
n<1.2
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B
n<n
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C
n=1.2n
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D
n=1.2n
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Solution

The correct option is B n<n
From medium 1 to 2, light bends towards normal
Which means n>1.2.

But between medium 2 and 3, light is reflecting completely.
It means T.I.R takes place from 2 to 3.
Hence n>n

So, option B is correct.

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