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In Young's double slit experiment the distance between the slits and the screen is doubled. The separation between the slits reduced to half. As a result the fringe width:

Options

  1. Ais halved
  2. Bbecomes four times
  3. Cremains unchanged
  4. Dis doubled

Correct answer

B. becomes four times

Step-by-step solution

In Young's double slit experiment fringe width = D d where D= distance between slit and screen d= distance between slit According to the question D is double 2 D and d is half d 2 Ther New fringe wilth will be 2 D d 2 = 4 D d =4 ( D d )= ^1=4 i.e., becomes four times

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