EC > GATE 2016 SET-2 > Optical Fiber
Light from free space is incident at an angle θi to the normal of the facet of a step-index large core optical fibre. The core and cladding refractive indices are n1=1.5 and n2=1.4 respectively.
The maximum value of θi (in degrees) for which the incident light will be guided in the core of the fibre is
Correct : 32.5
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