In a single slit diffraction, the width of slit is `0.5 cm`, focal lengths of lens is 40 cm and
Channel: Doubtnut
Date: 2020-06-14

In a single slit diffraction, the width of slit is `0.5 cm`, focal lengths of lens is 40 cm and wavelength of light  is 40 cm and wavelength of light is `4890Å`. Distance of rist dark fringe is