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For a parallel beam of monochromatic light of wavelength `lambda` diffraction is produced by a singe slit whose width a is of the order of the wavelength of the light. If D is the distance of the screen from the slit, the width of the central maxima will be

A

`(Dlambda)/a`

B

`(Da)/lambda`

C

`(2Da)/lambda`

D

`(2Dlambda)/a`

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The correct Answer is:
D
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