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ifos โ€ข paper_1 โ€ข waves_oscillations

[UPSC IFoS 2010] Polarisation and Modern Optics (Q410, 15M)

With a suitable diagram, deduce an expression for numerical aperture (NA) for an optical fiber having refractive indices of core and cladding n_1 and n_2, respectively and being placed in a medium of index n_0.

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