Explain the term critical angle with the aid of a labelled diagram-

Question

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Critical angle- The angle of incidence in the denser medium corresponding to which the angle of refraction in the rarer medium is -90-0- is called the critical angle-

Explain the term critical angle with the aid of a labelled diagram.

Critical angle: The angle of incidence in the denser medium corresponding to which the angle of refraction in the rarer medium is $$90^{0}$$ is called the critical angle.