Light from free space is incident at an angle θ 1 to the normal of the facet of a step-index large core optical fibre. The core and cladding refractive indices are n 1 = 1.5 and n 2 = 1.4, respectively. The maximum value of θ 1 (in degrees) for which the incident light will be guided in the core of the fibre is ________.

GATE Electronics and Communications (EC) 2016 Shift 2 Solved Paper

Question : 35 of 65

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Light from free space is incident at an angle θ₁to 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 θ₁(in degrees) for which the incident light will be guided in the core of the fibre is ________.

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