question_answer

A system of three polarizers \[{{P}_{1}},{{P}_{2}},{{P}_{3}}\]is set up such that the pass axis of\[{{P}_{3}}\]is crossed with respect to that of \[{{P}_{1}}\]. The pass axis of \[{{P}_{2}}\]is inclined at \[60{}^\text{o}\] to the pass axis of \[{{P}_{3}}\]. When a beam of unpolarized light of intensity \[{{I}_{0}}\] is incident on \[{{P}_{1}},\]the intensity of light transmitted by the three polarizers is I. The ratio \[({{I}_{0}}/I)\] equals (nearly) : [JEE Main 12-4-2019 Afternoon]

A) 16.00

B) 1.80

C) 5.33

D) 10.67

Correct Answer: D

Solution :

[d] Since unpolarised light falls on  intensity of light transmitted from

Pass axis of will be at an angle of  with

Intensity of light transmitted from

Pass axis of is at an angle of  with  Intensity of light transmitted from