Physics - Wave Optics Question with Solution | TestHub

In baptism experiment, the distance between source and eyepiece is$1.2\mathrm{}\mathrm{m},$the distance between two virtual sources is$0.84\mathrm{}\mathrm{m}\mathrm{m}.$Then, the wavelength of light used if eyepiece is to be moved transverselythrough a distance of$2.799\mathrm{}\mathrm{c}\mathrm{m}$to shift$30$fringes is