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(i) State the principle on which the wor...

(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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