Unpolarized light of intensity I passes ...

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 `(I)/(2)` Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be `(I)/(8)` . The angle between polarizer A and C is :

`60^(@)`

`0^(@)`

`30^(@)`

`45^(@)`

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