(a) Explain propagation of light through an optical fibre. Derive an…

Question

(a) Explain propagation of light through an optical fibre. Derive an expression for critical angle of propagation.

(b) A glass fibre is made with core glass of refractive index $1.5$ and the cladding is doped to give a fractional index difference of $0.0005$.

Find :

(a) cladding index, and

(b) numerical aperture.

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