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In a double-slit experiment, if the distance between the slits is increased, wha

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Question: In a double-slit experiment, if the distance between the slits is increased, what happens to the distance between the interference fringes? (2021)

Options:

  1. Increases
  2. Decreases
  3. Remains the same
  4. Becomes zero

Correct Answer: Decreases

Exam Year: 2021

Solution: 

The distance between the fringes decreases as fringe width β = λD/d; increasing d reduces β.

In a double-slit experiment, if the distance between the slits is increased, wha

Practice Questions

Q1
In a double-slit experiment, if the distance between the slits is increased, what happens to the distance between the interference fringes? (2021)
  1. Increases
  2. Decreases
  3. Remains the same
  4. Becomes zero

Questions & Step-by-Step Solutions

In a double-slit experiment, if the distance between the slits is increased, what happens to the distance between the interference fringes? (2021)
  • Step 1: Understand the double-slit experiment. It involves light passing through two slits and creating a pattern of bright and dark lines called interference fringes.
  • Step 2: Know the formula for fringe width (distance between fringes), which is β = λD/d, where λ is the wavelength of light, D is the distance from the slits to the screen, and d is the distance between the slits.
  • Step 3: Identify what happens when the distance between the slits (d) is increased. According to the formula, if d increases, the value of β (fringe width) decreases.
  • Step 4: Conclude that as the distance between the slits increases, the distance between the interference fringes decreases.
  • Interference Patterns – The question tests understanding of how the distance between interference fringes in a double-slit experiment is affected by the distance between the slits.
  • Fringe Width Formula – The relationship between fringe width (β), wavelength (λ), distance to the screen (D), and slit separation (d) is crucial for solving the problem.
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