Answer:
Brewster angle is the angle of incidence at which a beam of unpolarised light falling on a transparent surface is reflected as a beam of completely plane polarised light. According to Brewster law, \[\mu =\tan {{i}_{B}}=\frac{1}{\cot {{i}_{B}}}\] Also, \[\mu =\frac{1}{\sin {{i}_{C}}}\] On comparing, \[\sin {{i}_{C}}=\cot {{i}_{B}}\] Hence, \[{{i}_{C}}={{\sin }^{-1}}(\cot {{i}_{B}})\].
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