The critical angle of ordinary glass is 42 (approx.) with respect to air. What does it mean?
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it means that the refractive index is greather than that of the glass..
if refractive index is more than the given critical angle of glass or diamond would be less than that.
hope it helps u now
Answered by
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It means that angle of incidence at the denser medium (glass) corresponding to which the angle of refraction in the rarer medium is 42.
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