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

Listen NCERT Audio Books to boost your productivity and retention power by 2X.


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.


Refractive index of optical fibre ==1.72

Refractive index of glass coating == 1.50

Critical angle

By Snell’s law;

The critical angle =

Chapter Exercises

More Exercise Questions