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(i) State the principle on which the working of an optical fiber is based. (ii) What are the necessary conditions for this phenomenon to occur ?

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(i) State the principle on which the working of an optical fiber is based.
(ii) What are the necessary conditions for this phenomenon to occur ?
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(i) Total internal reflection.
(ii) Optical fibre consists of high quality quartz fibres. Each fibre consists of a core and cladding. The refractive index of the material of the core is higher than that of the cladding.
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