A) \[45{}^\circ \]
B) \[60{}^\circ \]
C) \[0{}^\circ \]
D) \[30{}^\circ \]
Correct Answer: A
Solution :
| [a] Polarizing axis of A & B polarizer are parallel to each other |
| \[{{\text{I}}_{\text{1}}}\text{=}\frac{\text{I}}{\text{2}}\text{co}{{\text{s}}^{\text{2}}}\theta \] |
| \[\frac{I}{8}={{I}_{1}}{{\cos }^{2}}\theta \] |
| \[\frac{I}{8}=\frac{I}{2}{{\cos }^{4}}\theta \] |
| \[\cos \theta =\frac{1}{\sqrt{2}}\] |
| \[\] |
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