Normally monochromatic light falls on a diffraction grating of length l = 20 mm, containing n = 1.0 • 104 lines. The spectrometer's telescope is aimed at the main first-order maximum. To point the tube at another maximum of the same order, it must be rotated through an angle a = 40°. Determine: 1) light wavelength; 2) the number of maxima observed in the spectrum of the diffraction grating; 3) the angle of deflection of the rays corresponding to the last maximum.
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