A) \[{{35}^{o}}\]
B) \[{{40}^{o}}\]
C) \[{{45}^{o}}\]
D) \[{{50}^{o}}\]
E) Not available
Correct Answer: E
Solution :
From law of Malus \[I={{I}_{0}}\,\,{{\cos }^{2}}\theta \] Given, \[I=\frac{{{I}_{0}}}{4}\] \[\frac{1}{4}={{\cos }^{2}}\,\theta \] \[\Rightarrow \] \[\cos \,\,\theta =\frac{1}{2}\] \[\Rightarrow \] \[\theta ={{60}^{o}}\] Note None of the options are correct.
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