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

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

Q1MHT CET 2026 · 19 APR · SHIFT 2Easy

Total Internal Reflection

Light travels a distance 'x' in time ' $t_0$ ' in air and ' $4x$ ' in time ' $t_1$ ' in another denser medium. The critical angle for this medium is

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Answer: (b)

Speed in air $c = \frac{x}{t_0}$ ; speed in medium $v = \frac{4x}{t_1}$ .
$\sin C = \frac{1}{\mu} = \frac{v}{c} = \frac{4x/t_1}{x/t_0} = \frac{4t_0}{t_1}$
So the answer is (b) $\sin^{-1}\left(\frac{4t_0}{t_1}\right)$ .

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