question_answer

Two polaroids have their axes at an angle of \[60{}^\circ \] in between. If Io is intensity of unpolarised light falling on first Polaroid then that of emerging light from the second Polaroid is-

A) \[0.125\text{ }{{I}_{0}}\]                     

B) \[0.25\,\,{{I}_{0}}\]

C) \[0.375\text{ }{{I}_{0}}\]                     

D) \[0.50\text{ }{{I}_{0}}\]

Correct Answer: A

Solution :

Intensity of finally emerged light is \[=\,\,\frac{{{I}_{0}}}{2}{{\cos }^{2}}60{}^\circ \,\,=\,\,\frac{{{I}_{0}}}{8}\]