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The cladding which surrounds the optic fiber line is used

(a) To protect the fiber

(b) To reduce optical interference

(c) Because it help to guide light in the core

(d) To ensure that refractive index remains constant

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Option C should be Correct.

 Cladding provides a lower refractive index at the core interface to cause reflection within the core and light are transmitted through the fiber

The cladding increases the critical angle within the core fibre and also prevents adjacent fibres from touching each other. 

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