4. When a ray of light is incident at a critical angle in denser medium, the angle of refraction in rarer medium is
A 0°
B 45°
C 90°
D 180°

C. 90°

Explanation:

The critical angle is that angle of incidence in the dense medium where the angle of refraction is 90°.

In this case, light travels from the more optically dense medium to the less optically dense medium.

When the angle of incidence in the dense medium is equal to the critical angle, the angle of refraction is 90°.

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