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(B) When light travels from an optically denser medium to an optically rarer medium, it bends away from the normal.As the angle of incidence increases

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Critical angle

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(B) When light travels from an optically denser medium to an optically rarer medium, it bends away from the normal.As the angle of incidence increases, the angle of refraction also increases.The specific angle of incidence at which the angle of refraction becomes $90^{\circ}$ (i.e., the refracted ray grazes the interface of the two media) is known as the $	ext{Critical angle}$.

When a light ray travels from an optically denser medium to an optically rarer medium, what is the angle of incidence called at which the angle of refraction becomes $90^{\circ}$?

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