# The figure shows a double slit experiment with P and Q as the slits. The path lengths PX and QX are nlambda and (n+2)lambda respectively, where n

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The figure shows a double slit experiment with P and Q as the slits. The path lengths PX and QX are nlambda and (n+2)lambda respectively, where n is a whole number and lambda 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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