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in Physics by (72.1k points)
In YDSE apparatus shown in figure wavlength of light used is `lambda`. The screen is moved away form the source with a constant speed v. Initial distance between screen and plane of slits was D.
image
At a point P on the screen the order of fringe will
A. `(2D)/(v)`
B. `(D)/(v)`
C. `(3D)/(2v)`
D. `(3D)/(v)`

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