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[" 14.In optical fibre refractive index ...

[" 14.In optical fibre refractive index of core is "],[" 1) Less than R.I.of cladding "],[" 2) More than R.I.of cladding "],[" 3) Equal to R.I.of cladding "],[" 4) Half of R.I.of cladding "]

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