Question

The diagram shows a right angled prism being used to turn a ray of light through 90°. what is the critical angle for the light in the glass ?
(A) less than 45°
(B) equal to 45°
(C) greater than 45°
(D) equal to 90°

Answer 1

A)less than 45° because here total internal reflection occur which is possible only when angle of incidence is more than critical angle
So if angle of incidence is 45° so critical
angle will be less than 45°

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