A light ray enters from medium A to medium B as shown in Figure 10.2. The refractive index of medium B relative to A will be:

1. greater than unity
2. less than unity
3. equal to unity
4. Zero

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Here, medium A is a rarer medium and B is a denser medium. Let $v_1$ is the speed of the ray in medium A and $v_2$ is the speed of the ray in medium B.

And we know that the speed of ray in a rarer medium $(v_1)$ is always greater than the speed of ray $(v_2)$ in a denser medium.

Therefore, refractive index of medium B relative to medium B is: $n=\frac{v_1}{v_2}$

This means $n>1$

Therefore, option A is correct.

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Updated on: 10-Oct-2022

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