Question

The angle between the pass axis of polarizer and analyzer is ${45}^{\circ }$. The percentage of polarised light passing through analyzer is:

• A. $75\%$
• B. $25\%$
• C. $50\%$
• D. $100\%$

Answer 1

The correct option is C $50\%$

Given,

$\theta ={45}^0$

By malus law,

$I\propto co{s}^2\theta$

$I\propto (cos{45}^0{)}^2$

$I\propto {\left(\frac{1}{\sqrt{2}}\right)}^2$

$I\propto \left(0.5\right)$

The percentage of polarized light passing through analyzer is $50$%.

The correct option is C.