Answer to Question #288572 in Mechanical Engineering for Adi

Question

A polarizer and analyzer are oriented so that the amount of transmitted light is maximum. Through what

possible angles should either be turned so that the intensity of transmitted light by the analyzer is reduced

to 75% and 25% of the maximum intensity

Answer 1

If $I_0$

is an incident, then after passing through

the polarizer then Intensity becomes $\frac{I_0}{2}$

Now when the analyzer is rotated the transmitted

intensity reduces.

$I=\frac{I_0}{2}cos^2\theta$

​

If θ is the angle of rotation

$θ=30^0$

$I=\frac{I_0}{2}×cos^2 30 =0.375I_0$