Question: A monochromatic beam falls on a reflection grating with period d = 1.0 mm at a glancing angle o = 1.0% When it is diffracted

A monochromatic beam falls on a reflection grating with period d = 1.0 mm at a glancing angle αo = 1.0% When it is diffracted at a glancing angle α = 3.0° a Fraunhofer maximum of second order occurs. Find the wavelength of light.

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