HC Verma - Concepts of Physics Part 1

Book: HC Verma - Concepts of Physics Part 1

Chapter: 18. Geometrical Optics

Subject: Physics - Class 11th

Q. No. 26 of Exercises

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26

An optical fibre (μ = 1.72) is surrounded by a glass coating (μ = 1.50). Find the critical angle for total internal reflection at the fibre-glass interface.

26.PNG


Refractive index of optical fibre ==1.72


Refractive index of glass coating == 1.50


Critical angle


By Snell’s law;





The critical angle =


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