Question

Unpolarised light of intensity 32 watt `m^(-2)` passes through three polarises such that the transmission axes of the first and second polarises makes an angle `30^(@)` with each others the transmission axes of the second and third polarises makes an angle `60^(@)` with each other. The intensity of final emerging light will
A. 32 watt `m^(-2)`
B. 3 watt `m^(-2)`
C. 8 watt `m^(-2)`
D. 4 watt `m^(-2)`

Answer 1

Correct Answer - B
`I_(0)` is intensity of unpolarized incident light
`I=(I_(0))/(2)cos^(2)30^(@)" "cos^(2)60^(@)=3` watt `m^(-2)`