1.

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 brightB. First darkC. Second brightD. Second dark

Answer» Correct Answer - C
For brightness, path difference `= n lamda = 2 lamda` So second is bright.


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