A) linearly polarized
B) circularly polarized
C) ellipticallypolarized
D) unpolarised
Correct Answer: D
Solution :
A quarter wave plate is a plate of calcite or quartz. Its refracting faces are cut parallel to the direction of optic axis. The thickness of plate is such that it introduces a phase difference of \[\frac{\pi }{2}\] or path difference of \[\frac{\lambda }{4}\]between ordinary and extra ordinary wave. it does not convert ordinary light to polarized one. Note: A Nicol prism is used to convert ordinary unpolarized light to polarized one.
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