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Question

The colour which has least critical angle is

A
Orange
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B
Red
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C
Violet
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D
Green
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Solution

The correct option is B Violet
For total internal reflection to take place. μsinθc=1θc=sin1(1μ)
As a fact, the refractive index for a ray is inversely proportional to its wavelength.
μ×1λ Since violet has shortest wavelength it's critical angle is also low

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