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MHT CET 2021 (21 Sep, Shift 2) · Total Internal Reflection

Total Internal Reflection question from MHT CET 2021 (21 Sep, Shift 2)

Q31MHT CET 2021 · 21 SEP · SHIFT 2Easy

Total Internal Reflection

The refractive index of glass is 1.5 and that of water is 1.33. The critical angle for a ray of light going from glass to water is

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Answer: (c)

Glass to water: $\sin C = \frac{\mu_w}{\mu_g}$ .
$\sin C = \frac{4/3}{3/2} = \frac{8}{9}$ (using $1.33 \approx \frac{4}{3}$ )
So the answer is (c) $\sin^{-1}\left(\frac{8}{9}\right)$ .

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