Solution to task 517 from Chertov´s for extramural stud

Solution to task 517 from Chertov´s for extramural stud

517. Monochromatic light is normally incident on a diffraction grating containing n = 100 lines per mm. The telescope of the spectrometer is aimed at the second-order maximum. To bring the pipe to another maximum of the same order, it must be turned by an angle Δφ = 16 °. Determine the wavelength λ of the light incident on the grating.