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A narrow slit S transmitting light of wa...

A narrow slit S transmitting light of wavelength `'lambda'`. Is placed at a distance d above a large plane mirror as shown. The light coming directly from the slit and that coming after the reflection interfere at a screen S placed at a distance D from the slit. at what distance from point O, the resultant intensity is maximum ? (there is a phase change of `pi` of reflection from the mirror)

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`(lambdaD)/(4d)`
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