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Question

In YDSE apparatus shown in figure wavelength of light used is λ. The screen is moved away from the source with a constant speed v. Initial distance between screen and plane of slits was D and at point P on screen, nth order bright fringe is observed.

As the screen moves away value of n will

A
increase
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B
decrease
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C
remain constant
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D
first increase then decrease
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Solution

The correct option is B decrease
The distance of nth order bright fringe from central maxima is
y=nλDd
or n=ydλD
As the screen moves away, D increases and n will decrease.

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