Question

Determine the intensity after polarizer C. Axis of orientations are given. Initial intensity is $I_o$ units.

• A. $\frac{I_o}{25}$
• B. $\frac{9I_o}{25}$
• C. $\frac{12I_o}{25}$
• D. $\frac{6I_o}{25}$

Answer 1

The correct option is D $\frac{6I_o}{25}$

after A $\frac{I_o}{2}$
after B $\frac{I_o}{2}co{s}^2{30}^o$
after C $\frac{I_o}{2}co{s}^{2}30co{s}^{2}37$
=$\frac{I_o}{2}\times \frac{3}{4}\times \frac{4}{5}\times \frac{4}{5}$
$=\frac{6I_o}{25}$