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Statement of a problem № 4039

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A diffraction grating used at normal incidence gives a green line, L = 5400 A in a certain order superimposed on the violet line, L = 4050 A of the next higher order. If the angle of diffraction is 30°, how many lines are there per centimetre in the grating?

Solution:
A diffraction grating used at normal incidence gives a green line, L = 5400 A in

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