Question: Consider a reflection grating operating with an incident angle of 40 in Figure 19-7. (a) How many lines per centimeter should be etched in

Consider a reflection grating operating with an incident angle of 40 in Figure 19-7.
(a) How many lines per centimeter should be etched in the grating if the first-order diffraction angle for 600-nm (visible) light is to be - 30°?
(b) Answer the same question for 1 000 cm-1 (infrared) light.

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