A wide slab consisting of two media of refractive indices n…

Maths JEE - Advanced Previous Year Paper JEE-Advanced-2021-Paper-1 Single Correct MCQ

Published on: August 14, 2026

A wide slab consisting of two media of refractive indices n 1 and n 2 is placed in air as shown in the figure. A ray of light is incident from medium n 1 to n 2 at an angle , where sin is slightly larger than 1/n 1 . Take refractive index of air as Which of the following statement(s) is(are) correct?

The light ray enters air if n 2 = n 1

The light ray is finally reflected back into the medium of refractive index n 1 if n 2 < n 1

The light ray is finally reflected back into the medium of refractive index n 1 if n 2 > n 1

The light ray is reflected back into the medium of refractive index n 1 if n 2 = 1

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The correct answer is:

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(b, c, d)

The ray diagram for the following conditions are

The light finally must reflected back in medium of refractive index n 1 for all values of n 2 .

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