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Q1. If red light of wavelength 620 nm drops on a single slit, it makes a central diffraction maximum that is 8.80 mm broad on a screen 2.00 m away. How wide is the slit? How wide will the central peak be if the red light is substituted with a blue light of wavelength 500 nm?

Q2. The sodium D line is a doublet comprising of two wavelengths, 588.995 and 589.592 nm. find out the angular separation between these two lines in the first-order spectrum for grating with 4000 lines per centimeter. Repeat it for the second order.

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