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Physics-

General

Easy

Question

The figure shows a double slit experiment P and Q are the slits. The path lengths PX and QX are $n lambda$ and $left parenthesis n plus 2 right parenthesis lambda$ respectively, where n is a whole number and $lambda$ is the wavelength. Taking the central fringe as zero, what is formed at X

First bright
First dark
Second bright
Second dark

The correct answer is: Second bright

For brightness, path difference $equals n lambda equals 2 lambda$
So second is bright.

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