Physics - Wave Optics Question with Solution | TestHub

In a biprism experiment, the slit separation is $1\mathrm{mm}$. Using monochromatic light of wavelength $5000\mathring{A}$, an interference pattern is obtained on the screen. Where should the screen be moved, so that the change in fringe width is $12\cdot 5\times 10^{-5}\mathrm{m}$ ?