The figure shows a double slit experiment P and Q are the slits. The path lengths PX and QX are nλ and (n+2)λ respectively, where n is a whole number and λ is the wavelength. Taking the central fringe as zero, what is formed at X

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First bright

First dark

Second bright

Second dark

answer is C.

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Detailed Solution

Path difference =2λ So second bright is formed.

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