Question

Optical fibre works on the principle of total internal reflection.

• A. True
• B. False

Answer 1

The correct option is A True

Total internal reflection is the phenomenon which occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle. In general, total internal reflection takes place at the boundary between two transparent media when a ray of light in a medium of higher index of refraction approaches the other medium at an angle of incidence greater than the critical angle.