Question 177 of 191

An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as $100$ Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by $30^{\circ}$ in clockwise direction, the intensity of emerging light will be _______Lumens.

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Answer: 75

Assuming initially axis of Polarizer and Analyzer are parallel

Now emerging intensity $=\dfrac{{I}_{0}}{2}{\cos }^{2}30^{\circ}$
$=100{\left(\dfrac{\sqrt{3}}{2}\right)}^{2}=100\times \dfrac{3}{4}=75$