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A beam of light passes through a narrow slit and produces a diffraction pattern.

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Question: A beam of light passes through a narrow slit and produces a diffraction pattern. What happens to the width of the central maximum if the slit width is decreased? (2019)

Options:

  1. It increases
  2. It decreases
  3. It remains the same
  4. It becomes zero

Correct Answer: It increases

Exam Year: 2019

Solution: 

According to the diffraction principle, as the slit width decreases, the width of the central maximum increases.

A beam of light passes through a narrow slit and produces a diffraction pattern.

Practice Questions

Q1
A beam of light passes through a narrow slit and produces a diffraction pattern. What happens to the width of the central maximum if the slit width is decreased? (2019)
  1. It increases
  2. It decreases
  3. It remains the same
  4. It becomes zero

Questions & Step-by-Step Solutions

A beam of light passes through a narrow slit and produces a diffraction pattern. What happens to the width of the central maximum if the slit width is decreased? (2019)
  • Step 1: Understand what a diffraction pattern is. It is the pattern created when light passes through a narrow opening (slit).
  • Step 2: Know that the central maximum is the brightest part in the middle of the diffraction pattern.
  • Step 3: Recognize that the width of the slit affects how light spreads out after passing through it.
  • Step 4: Learn that when the slit width decreases (becomes narrower), the light spreads out more.
  • Step 5: Conclude that as the light spreads out more, the width of the central maximum increases.
  • Diffraction of Light – The phenomenon where light waves spread out after passing through a narrow opening, leading to the formation of a pattern of light and dark regions.
  • Slit Width and Diffraction Pattern – The relationship between the width of the slit and the resulting diffraction pattern, where a narrower slit results in a wider central maximum.
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