1.

Unpolarized light of intensity I passes through an ideal polarizer A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to be (1)/(2) . Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be (1)/(8). The angle between polarizer A and C is ......

Answer»

`0^(@)`
`30^(@)`
`45^(@)`
`60^(@)`

Solution :
The intensity of light coming from plate A `(1)/(2)` is Which is also the intensity of light coming from C (intensity before B) is `(1)/(2)`
`:.` The intensity of light coming from C,
`:.(I)/(8)=(I)/(2) cos^(2) THETA`
`:.(I)/(4)=cos^(2) theta`
`:. (I)/(2)= cos^(2) theta`
`:. theta=6^(@)`


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