A beam of unpolarised light of intensity `I_0` is passed through a polaroidA and then through another polaroid B which is oriented so that its principal plane makes an angle of `45^circ` relative to that of A. The intensity of the emergent light is

Options

A. `I_(0)`
B. `I_(0)//2`
C. `I_(0)//4`
D. `I_(0)//8`

Answer

C

Explanation

Relation between intensities
`I_(R)=(I_(0)/2)cos^(2)(45^(@))=I_(0)/2xx1/2=I_(0)/4`