A diffraction grating has 600 lines/mm.The number of complete orders formed in the visible region 400 -700 nm is

Name: A diffraction grating has 600 lines/mm.The number of complete orders formed in the visible region 400 -700 nm is
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The maximum order m is given by m = d/λ, where d is the grating spacing (1/600 mm) and λ is the wavelength. For 400 nm, m = (1/600,000 mm) / (400 x 10^-9 m) ≈ 4.17, and for 700 nm, m ≈ 2.38. The maximum complete order is 2.

A Diffraction Grating Has 600 Lines/mm