Light is incident on a glass block as shown in figure. If θ1, is increased slightly, what happens to θ2?

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θ2also increases slightly

θ2 it unchanged

θ2 decreases slightly

θ2changes abruptly, since the ray experiences totalinternal reflection

answer is C.

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Detailed Solution

As θ1 increases, α also increases. so, (90° -α ) decreases and hence θ2 decreases.

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