A) \[60.2{}^\circ \]
B) \[16.8{}^\circ \]
C) \[43.7{}^\circ \]
D) \[33.7{}^\circ \]
Correct Answer: D
Solution :
From Brewsters law \[\mu =\tan \,{{i}_{p}}\]where \[{{i}_{p}}\] is angle of polarisation. Given, \[\mu =1.5\] \[\therefore \] \[{{i}_{p}}={{\tan }^{-1}}(1.5)={{56.3}^{o}}\]When r is angle of refraction, then we know that \[r+{{i}_{p}}={{90}^{o}}\] \[\Rightarrow \] \[r={{90}^{o}}-{{i}_{p}}\] \[={{90}^{o}}-{{56.3}^{o}}={{33.7}^{o}}\]
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