A narrow beam of unpolarised light of intensity `I_(0)` is incident on a polaroid `P_(1)`. The light transmitted by it is then incident on a second polaroid `P_(2)` with its pass axis making angle `60^(@)` relative to the pass axis of `P_(1)`. Find the intensity of the light transmitted by `P_(2)`.

Explanation

Intensity of light transmitted by `P_(1) = (I_(0))/(2) `
Applying Malus' law, intensity of light transmitted by
`P_(2) = (I_(0))/(2)cos^(2)60^(@) = (I_(0))/(8)`