Sodium light of wavelengths 589 nm and 589 6 nm are made incident normally on a grating having 500 lines mm Calculate the

Question

Sodium light of wavelengths 589 nm and 589 6 nm are made incident normally on a grating having 500 lines mm Calculate the angular dispersion of these lines in the spectrum of first order Obtain an expression for numerical aperture of an optical fibre 5 3 2

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