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Question

In YDSE setup (see figure), the screen moves towards the cardboard with speed v. If the distance between the slits is d and the distance between the screen and silts is D(dD) and λ is the wavelength of the light used, then the  INCORRECT option is


  1. The central fringe remains at rest
  2. The speed of 2nd bright fringe with respect to screen is 2λvd  ​​​​
  3. All the fringes shrink towards the central one
  4. The fringes above the central one move upward


Solution

The correct option is D The fringes above the central one move upward
As the screen moves towards the slits, the fringes shift closer to the central fringe

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