If the angle of incidence inside a denser medium exactly equals the critical angle, what is the resulting angle of refraction?

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1. If the angle of incidence inside a denser medium exactly equals the critical angle, what is the resulting angle of refraction?

0°

45°

90°

135°

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By definition, the critical angle is the specific angle of incidence at which the refracted ray grazes right along the boundary, at a 90° angle of refraction.