A Monochromatic Beam of Light of Wavelength 600 Nm Falls

Multiple Choice

A monochromatic beam of light of wavelength 600 nm falls on a grating at normal incidence and produces a second-order image at an angle of 30º.The grating spacing must be

A) 0.60 µm
B) 2.4 µm
C) 0.30 µm
D) 1.4 µm
E) 1.0 µm