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Question

Define critical angle.


Solution

When light ray travelling in denser medium is incident on the rarer medium at an angle of incidence such that the refracted ray grazes out through the interface boundary ($$\angle{r} = 90^0$$) then the angle of incidence is called critical angle $$i_c$$.
$$sin\ i_c = \dfrac{1}{\mu}$$ (If the rarer medium is air)

Physics

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