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GATE EC 2016 Set 2 — Question 35

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NAT+1 / -0MediumNumerical Aperture & ModesWaveguides & Optical FibersElectromagneticsLight Propagation in Fibers

Electromagnetics → Waveguides & Optical Fibers → Light Propagation in Fibers

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Question

Light from free space is incident at an angle θi\theta_i to the normal of the facet of a step-index large core optical fibre. The core and cladding refractive indices are n1=1.5n_1 = 1.5 and n2=1.4n_2 = 1.4, respectively.
diagram of a step-index optical fiber showing light incident from free space at angle $\theta_i$ to the core normal
The maximum value of θi\theta_i (in degrees) for which the incident light will be guided in the core of the fibre is ________
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