An unpolarised beam of intensity `2A^(2)` passes through a thin polaroid. Assuming that no light is absorbed by the polaroid, the amplitue of the emergent beam will be

Options

A. `2A^(2)`
B. `A^(2)`
C. 2A
D. A

Answer

D

Explanation

Intensityof light transmitted by polariser = Half of intensity of unpolarise d light
`:. I = A^(2)`
But intensity `prop ("Amplitude")^(2)`
`:.` Amplitude `= sqrt("intensity") = A`