A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at focal plane of convex lens. If the slit width is increased, the central maximum of the diffraction pattern will
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a
become broader and fainter
b
become broader and brighter
c
become narrower and fainter
d
become narrower and brighter
answer is D.
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Detailed Solution
β0=2λDd=2λfd or β0∝1d As d increases, β0 decreases. A broader slit allows more light to pass throw it ; as a result brightness of central bright fringe increases
A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at focal plane of convex lens. If the slit width is increased, the central maximum of the diffraction pattern will