Log1989 problem number 21.20

Log1989 problem number 21.20

The beam of light normally falls on the diffraction grating. The diffraction angle for the line, whose wavelength is 589 nm, in the first-order spectrum is 17 degrees 18 minutes. The angle of diffraction of some line in the second-order spectrum is 24 degrees 12 minutes. Find the wavelength of this line and the number of strokes per 1 mm of the lattice.

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