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Two polaroids are placed in the path of ...

Two polaroids are placed in the path of unpolarized beam of intensity I 0 such that the intensity of light emitted from the second polaroid is `9/50 l_(0).` If third polaroid whosepolarization axis makes an angle `theta` with the polarization axis of first polaroid, is placed between these polaroids, such that the intensity of light emerging from the last polaroid is zero, then angle `theta `is

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