A parallel beam of monochromatic light of wavelength 600 nm passes through single slit of 0.4 mm wid

Question

A parallel beam of monochromatic light of wavelength 600 nm passes through single slit of 0.4 mm width. Angular divergence corresponding to second order minima would be _______ $	imes 10^{-3} \mathrm{rad}$.\

Professor PC Thomas Classes · Answer

(6) : For minima condition in diffraction experiment, $\sin 	heta \simeq 	heta=\frac{n \lambda}{a}$\ For second order minima, $n=2$\ $	heta=\frac{2 	imes 600 	imes 10^{-9}}{0.4 	imes 10^{-3}}=3000 	imes 10^{-6}=3 	imes 10^{-3} \mathrm{rad}$\ Required angular divergence is $2 	heta=6 	imes 10^{-3}$ rad\