An optical fibre consists of core of µ 1 surrounded by a cladding of µ 2 1 . A beam of…
Physics · JEE Advanced · NTA Exams — Optics
An optical fibre consists of core of µ1 surrounded by a cladding of µ2 < µ1. A beam of light enters from air at an angle α with axis of fibre. The highest α for which ray can be travelled through fibre is
- \(\cos ^{-1} \sqrt{\mu_{2}^{2}-\mu_{1}^{2}}\)
- \(\sin ^{-1} \sqrt{\mu_{1}^{2}-\mu_{2}^{2}}\)
- \(\tan ^{-1} \sqrt{\mu_{1}^{2}-\mu_{2}^{2}}\)
- \(\sec ^{-1} \sqrt{\mu_{1}^{2}-\mu_{2}^{2}}\)
Answer
(B) ^ -1 _ 1 ^ 2 - _ 2 ^ 2
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