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MHT CET 2026 (19 May, Shift 2) · Total Internal Reflection

Total Internal Reflection question from MHT CET 2026 (19 May, Shift 2)

Q6MHT CET 2026 · 19 MAY · SHIFT 2Medium

Total Internal Reflection

The minimum refractive index of the material of a right-angled isosceles prism as shown in the following figure is

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Answer: (b)

The ray enters face PQ normally and meets face PR at O with angle of incidence $45^\circ$ .
For TIR at O: $45^\circ \ge C$ , so $\sin45^\circ \ge \frac{1}{\mu}$ .
$\mu \ge \sqrt{2}$ .
So the answer is (b) $\sqrt{2}$ .

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