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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)

Text Solution

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`(lambdaD)/(4d)`
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Knowledge Check

  • In a double slit experiment, the distance between the slits is d. The screen is at a distance D from the slits. If a bright fringe is formed opposite to one of the slits, its order is

    A
    `(d)/(lambda)`
    B
    `(lambda^(2))/(dD)`
    C
    `(D^(2))/(2lambda D)`
    D
    `(d^(2))/(2D lambda)`

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