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Derive the expression of Numerical Aperture of Step- index fiber. What will happen to Numerical Aperture if cladding is removed?
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  • Numerical Aperture is the ability of fiber to collect the light from the source and save the light inside it by maintaining the condition of total internal reflection.

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  • Consider a light ray entering from a medium air of refractive index $n_o$ into the fiber with a core of refractive index …

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