In an optical fibre, core and cladding were made materials of refractive indices 1.5 and 1.414 respectively. to observe total internal reflection, what will be the range of incident angle with the axis of optical fibre?

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00−600

00−480

00−300

00−820

answer is C.

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Detailed Solution

The range of incident anglesinθ=μ12−μ22μ0θ=sin−1(1.5)2−(1.414)2 [for air μ0=1]θ=sin−1(0.5006)θ=300Hence, option (c) is correct.