Critical angle of light passing from glass to air is minimum for wavelength of (a) red colour (b) yellow colour (c) green colour (d) blue colour

Answer: (d). sin C = 1/μ, so C is smallest when μ is largest. By dispersion, μ is largest for the shortest wavelength (blue among the options). So the answer is (d) blue colour.

Critical angle of light passing from glass to air is minimum for… | MHT CET 2024 (11 May, Shift 2)

Q13MHT CET 2024 · 11 MAY · SHIFT 2Easy

Total Internal Reflection

Critical angle of light passing from glass to air is minimum for wavelength of

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Answer: (d)

$\sin C = \frac{1}{\mu}$ , so $C$ is smallest when $\mu$ is largest.
By dispersion, $\mu$ is largest for the shortest wavelength (blue among the options).
So the answer is (d) blue colour.

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