Question: How many lines per millimeter are required in a grating if the first-order diffraction line at 450 nm is to be observed at a reflection

How many lines per millimeter are required in a grating if the first-order diffraction line at 450 nm is to be observed at a reflection angle of 10 deg when the angle of incidence is 60 deg? What wavelength would have a second order diffraction line at the same position in nanometers (nm).

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