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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 position of the interference fringes? (2020)

Options:

  1. Fringes move closer together
  2. Fringes move further apart
  3. Fringes disappear
  4. Fringes remain unchanged

Correct Answer: Fringes move closer together

Exam Year: 2020

Solution: 

Increasing the slit separation d decreases the fringe width, causing the fringes to move closer together.

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 position of the interference fringes? (2020)
  1. Fringes move closer together
  2. Fringes move further apart
  3. Fringes disappear
  4. Fringes remain unchanged

Questions & Step-by-Step Solutions

In a double-slit experiment, if the distance between the slits is increased, what happens to the position of the interference fringes? (2020)
  • Step 1: Understand that in a double-slit experiment, light passes through two slits and creates a pattern of bright and dark lines called interference fringes.
  • Step 2: Know that the distance between the two slits is called 'slit separation' and is represented by 'd'.
  • Step 3: When the slit separation 'd' is increased, the distance between the slits becomes larger.
  • Step 4: Realize that increasing 'd' affects the fringe width, which is the distance between adjacent bright or dark fringes.
  • Step 5: Understand that a larger slit separation means the fringes will be closer together, resulting in a smaller fringe width.
  • Step 6: Conclude that as the slit separation increases, the interference fringes move closer together.
  • Interference Patterns – The behavior of light waves when they pass through two closely spaced slits, resulting in a pattern of bright and dark fringes on a screen.
  • Fringe Width – The distance between adjacent bright or dark fringes in an interference pattern, which is affected by the distance between the slits and the wavelength of light used.
  • Slit Separation – The distance between the two slits in a double-slit experiment, which influences the spacing of the interference fringes.
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