A screen is placed 2 m away from a narrow slit. If a plane wave of wavelength $5000 \mathrm{~A}^{0}$

Question

A screen is placed 2 m away from a narrow slit. If a plane wave of wavelength $5000 \mathrm{~A}^{0}$ is incident normally on the slit, the first minima lie 5 mm on either side of the central maximum. The width of the slit is\

Professor PC Thomas Classes · Answer

$\beta=\frac{2 D \lambda}{a}$\