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A diffraction grating with 180 slots/mm is illuminated with a light that contains only two wavelengths...

A diffraction grating with 180 slots/mm is illuminated with a light that contains only two wavelengths 400nm and 500 nm. The signal has aangle of incidence of 5 °. What is the angular distance between the second-order maxima of the two wavelengths? What is the smallest angle at which the two maxima overlap? What is the highest order at which maximums associated with the two wavelengths are present in the diffraction pattern?

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