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Question: Answered & Verified by Expert
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
PhysicsWave OpticsNEET
Options:
  • A Become broader and fainter
  • B Become broader and brighter
  • C Become narrower and fainter
  • D Become narrower and brighter
Solution:
2886 Upvotes Verified Answer
The correct answer is: Become narrower and brighter
Width of central maximum

β=Dλd,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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