A light ray enters from medium A to medium B

Question:

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

(a) greater than unity

(b) less than unity

(c) equal to unity

(d) zero

Solution:

(a).

Explanation:

Explanation : $n_{\mathrm{BA}}=\frac{v_{1}}{v_{2}}$

where v1 = speed of light in medium A

V2 = speed of light in medium B.

Since ray of light bends towards the normal, when it goes from medium A to rrtedium B, therefore, medium A is rarer and medium B is denser

medium. Speed of light in rarer medium (v1) is greater than the speed of light in denser medium (v2). Hence, nBA > 1.

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