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Manipal MET2018PhysicsWave Optics

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

Options

  1. Abecome broader and fainter
  2. Bbecome broader and brighter
  3. Cbecome narrower and fainter
  4. Dbecome narrower and brighter

Correct answer

D. become narrower and brighter

Step-by-step solution

Width of central maximum = D d , d being slit width. If the slit width is increased the central maximum becomes narrower and more light reaches the region.

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