A beam of white light (f = 400 nm and cr = 760 nm) is normally incident on a diffraction grating 1 cm wide. The beginning of the first-order spectrum is observed at an angle of 2 ° to the lattice normal. Determine the angle between the end of the first order spectrum and the beginning of the third order; can the grating resolve in second order 588 nm and 588.6 nm lines?

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