The figure shows a double slit experiment whereand Q are the slits. The path lengths P X and Q X ...

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The figure shows a double slit experiment whereand Q are the slits. The path lengths P X and Q X are n λ 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
(a) First bright
(b) First dark
(c) Second bright
(d) Second dark

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