Question:
A cylindrical optical fibre quarter circular shape of
Last updated: 6/9/2023
![A cylindrical optical fibre quarter circular shape of](https://media.kunduz.com/media/sug-question-candidate/20210518074119539178-3371989.jpg?h=512)
A cylindrical optical fibre quarter circular shape of refractive index n 2 and diameter d 4mm is surrounded by air A light beam is sent into the fibre along its axis as shown in figure Then the smallest outer radius R in mm as shown in figure for which no light escapes after first incident on curved surface of fibre is