Define charge and current density & derive continuity equation for charge and current density.

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Define charge and current density & derive continuity equation for charge and current density.

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The refractive indices of core and cladding materials of a step index fibre are 1.48 and 1.45, respectively. Calculate: (i) numerical aperture, (ii) acceptance angle, and (iii) the critical angle at the core-cladding interface and (iv) fractional refractive indices change.