A grating (with 15,000 lines per inch) is illuminated by sodium light. The grating spectrum is observed on the focal plane of a convex lens of focal length 10 cm. Calculate the separation between the D1 and D2 lines of sodium. (The wavelengths of D1 and D2 lines are 5890 and 5896 Å respectively.) [Hint : You may use Eq. (65).]
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