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JEE · NEET Previous Year Question

$Critical angle of incidence for a pair of optical media is . The refractive indices of first and second media are in the ratio:$

Topic: JEE PYQ

Answer: B. Full step-by-step solution below.

A $1 : 2$
B $2 : 1$
C $2 : 1$
D $1 : 2$

Correct answer: B

Solution

(b) sin θ_{c} = \frac{μ _{R}}{μ _{d}} = \frac{μ _{2}}{μ _{1}} sin 45^{\circ} = \frac{μ _{2}}{μ _{1}} \Rightarrow \frac{1}{2} = \frac{μ _{2}}{μ _{1}} \Rightarrow \frac{μ _{1}}{μ _{2}} = \frac{2}{1}

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