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CSE · Paper I · Waves & Opticscse-2018-subject-02-003

Plane transmission grating — UPSC Physics Optional CSE 2018 Paper I

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A plane transmission grating has 3000 lines in all, having width of 3\ \mathrm{mm}. What would be the angular separation in the first order spectrum of the two sodium lines of wavelengths 5890\mathring{\mathrm{A}} and 5896\mathring{\mathrm{A}}? Can they be seen distinctly?

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