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Two polaroids, P(1)andP(2) are set-up so...

Two polaroids, `P_(1)andP_(2)` are set-up so that their pass-axis crossed with respect to each other. A third polaroids, `P_(3)` is now introduces between these two so that its pass-axis makes and anlge `theta` with the pass-axis of `P_(1)`.
A beam of unpolarised light, of intensity I, is incident on `P_(1)`. If the intensity of light, that gets transmitted through this combination of three polaroids is I find the ratio `((I)/(I))` when `theta` equals.
`(i) 30^(@)" "(ii)45^(@)`

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