At critical angle of incidence, the angle of refraction is _______

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Solution

When light travelling in denser medium strikes at the interface of rarer medium at critical angle it gazes out through the inetrface boundary i.e., angle of refraction $∠ r = 90^{0}$

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At critical angle of incidence, the angle of refraction is _______

When light travelling in denser medium strikes at the interface of rarer medium at critical angle it gazes out through the inetrface boundary i.e., angle of refraction ∠r=900

When light travelling in denser medium strikes at the interface of rarer medium at critical angle it gazes out through the inetrface boundary i.e., angle of refraction $∠ r = 90^{0}$