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A narrow monochromatic beam of light of intensity 1 is incident on a glass plate as shown in figure Another identical glass plate is kept close to the first one and parallel to it. Each glass plate reflects `25%` of the light incident on it and transmits intensities in the interference pattern formed by two beams obtained after one reflection at each plate.

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PHYSICS GALAXY - ASHISH ARORA-WAVE OPTICS-Unsolved Numerical Problems
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