Question

A polaroid is placed at 45^o to an incoming light of intensity $I_{0}$. Now the intensity of light passing through polaroid after polarisation would be.

• A. $I_{0}$
• B. $\mathbf{I}_{\mathbf{0}}\mathbf{/2}$
• C. $I_{0}/4$
• D. Zero

Answer 1

Answer: (B)

$\mathbf{I}_{\mathbf{0}}\mathbf{/2}$

Answer 2

$I = I_{0}\cos^{2}\theta$= I₀ cos² 45 $= \frac{I_{0}}{2}$