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A step index fibre has critical angel at the core-cladding interface ?

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A step index fibre has critical angel at the core-cladding interface ?
A. `60^(@)`
B. `75^(@)`
C. `45^(@)`
D. None of these
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1 Answer

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Correct Answer - d
`(mu_(1)-mu_(2))/(mmu_(1))=(0.88)/(100)`
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