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A diffraction grating used at normal incidence gives a line, λ1 = 6000 A˚ in a certain order superimposed

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A diffraction grating used at normal incidence gives a line, λ1 = 6000 A˚ in a certain order superimposed on another lineλ2 = 4500 A˚ of the next higher order. If the angle of diffraction is 30˚, how many lines are there in a cm in the grating?

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