Unpolarised light of intensity `32 Wm^(-2)` passes through three polarizer such that the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light is `3Wm^(-2)`. The intensity of light transmitted by first polarizer will be

Options

A. `32 Wm^(-2)`
B. `16 Wm^(-2)`
C. `8 Wm^(-2)`
D. `4 Wm^(-2)`

Answer

B

Explanation

Intensity of light transmitted by first is half of intensity of unpolarised light `= 16 W//m^(2)`.