Define critical angle and write its conditions.

1.	Define critical angle and write its conditions.
Answer» The angle of incidence corresponding to which angle of refraction becomes 90º is called the critical angle. Conditions: i Light should travel from denser medium to rarer medium ii For total internal reflection angle of incidence must be greater than critical angle.

Answer»

The angle of incidence corresponding to which angle of refraction becomes 90º is called the critical angle.

Conditions:

i Light should travel from denser medium to rarer medium

ii For total internal reflection angle of incidence must be greater than critical angle.

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Define critical angle and write its conditions.

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