Question

Two Nicole prisms are kept perpendicular. One of them is illuminated with a light intensity (natural) $I_o$. Two more nicol prisms are introduced in between symmetrically. Find the light intensity emitted from the last nicol prism.

• A. $\frac{27I_o}{64}$
• B. $\frac{27I_o}{128}$
• C. $9\frac{I_o}{32}$
• D. $\frac{9I_o}{64}$

Answer 1

The correct option is B $\frac{27I_o}{128}$

$I=\frac{I_o}{2}{\cos }^{6}30=\frac{I_o}{2}(\frac{\sqrt{3}}{2}{)}^6=\frac{27I_o}{128}$