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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


A
All the fringes shrink towards the central one
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B
The speed of 2nd bright fringe with respect to screen is 2λvd ​​​​
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C
The central fringe remains at rest
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D
The fringes above the central one move upward
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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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