ifos โข paper_1 โข 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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