Q122 / 180 · KCET 2023 · Physics

For a given pair of transparent media, the critical angle for which colour is maximum?

A
Green
Correct answer
B
Red
C
Blue
D
Violet

Solution

Red light has the longest wavelength and the smallest refractive index within the visible region. Thus, it bends least when passing from glass to air. As a result, its critical angle is maximum.

Hence, the correct answer is option: 'B'.

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