Which among the following term refers to the value of critical value?

Angle of refraction

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Angle of reflection

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Angle of deviation

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Angle of incidence

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Solution

The correct option is D Angle of incidence
The term 'critical angle' refers to the value of angle of incidence at which the angle of refraction is exactly equal to $90^{\circ}$ . Therefore critical angle refers to the value of angle of incidence.

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