Which light ray will have least critical angle, while travelling from water to air.

Red

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Yellow

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Green

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Violet

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Solution

The correct option is D Violet
We know that the critical angle is affected by the refractive index of second medium with respect to the first medium.
This in turn depends on:
Wavelength: Critical angle increases with increase in wavelength.
Wavelength ∝ Critical Angle
$λ_{R e d} > λ_{V i o l e t}$

$∴$ Least critical angle will be for violet.

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