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Questions  >>  CBSE XII  >>  Physics  >>  Wave optics
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A ray of light from a rarer medium strikes a denser medium as shown in the figure . The reflected and refracted rays make an angle of $90^{\circ}$ with each other . The angles of reflection and refraction are r and r' , the critical angle would be

$\begin{array}{1 1} \sin ^{-1} (\tan r) \\ \tan ^{-1} (\sin r ) \\ \sin ^{-1} (\tan n r') \\ \tan ^{-1} (\sin r') \end{array} $

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