Question

An unpolarised light beam of intensity 2I0 is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of 30° relative to that of P. The intensity of the emergent light is

• A. $\frac{I_0}{4}$
• B. $\frac{I_0}{2}$
• C. $\frac{3I_0}{4}$
• D. $\frac{3I_0}{2}$

Answer 1

Answer: (C)

$\frac{3I_0}{4}$

Answer 2

The intensity of the emergent light,
$I = I_0 × \frac{3}{4}$
So, the correct option is (C): $\frac{3I_0}{4}$