An unploarised beam of intensity `I_(0)` is incident on a pair of nicols making an angle of `60^(@)` with each other. The intensity of light emerging from the pair is

Options

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

Answer

C

Explanation

According to law of Malus,
`I=I_(0)cos^(2)theta = I_(0)(cos 60^(@))^(2)=I_(0)(1//2)^(2)`
`I=I_(0)//4`.