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  4. A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at the focal plane of a convex lens. If the slit width is increased, the central maximum of the diffraction pattern will

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Q. A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at the focal plane of a convex lens. If the slit width is increased, the central maximum of the diffraction pattern will

ManipalManipal 2018

Solution:

Width of central maximum
$\beta=\frac{ D \lambda}{d}, d$ being slit width.
If the slit width is increased the central maximum becomes narrower and more light reaches the region.