A slit of width a is illuminated by monochromatic light of wavelength 650 mm at normal
Channel: Doubtnut
Date: 2020-02-09

A slit of width a is illuminated by monochromatic light of wavelength 650 mm at normal incidence calculate the value of a when (a). The first minimum falls at an angle of diffraction of `30^(@)` (b). The first maximum falls at an angle of diffraction of `30^(@)`.