Determine the numerical aperture of a step index fibre when the core refractive index n1 = 1.5 and the cladding refractive index n2 = 1.48. Find the maximum angle for entrance of light if the fibre is placed in air.

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Determine the numerical aperture of a step index fibre when the core refractive index n1 = 1.5 and the cladding refractive index n2 = 1.48. Find the maximum angle for entrance of light if the fibre is placed in air.

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