Problem 5.129

Light with wavelength \(\lambda=0.60 \mu \mathrm{m}\) falls normally on a diffraction grating inscribed on a plane surface of a plano-convex cylindrical glass lens with curvature radius \(R=20 \mathrm{~cm} .\) The period of the grating is equal to \(d=6.0 \mu \mathrm{m} .\) Find the distance between the principal maxima of first order located symmetrically in the focal plane of that lens.