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Interference is produced with two coherent sources of same intensity. If one of the sources is covered with a thin film so as to reduce the intensity of light coming out of it, then

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a
bright fringes will be less bright and dark fringes will be less dark
b
bright fringes will be more bright and dark fringes will be more dark
c
the brightness of the bright fringes and the darkness of the dark fringes remain same
d
cannot be decided

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detailed solution

Correct option is A

For bright fringes,For dark fringes,So When


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Two coherent sources, S1 and S2 lie along the y-axis and a detector moves along +x-axis. The sources are separated by a distance four times the wavelength λ of the source. Find the number of points where maxima are observed, leaving the origin and far-off points.


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