JEE Main2003PhysicsCommunication SystemActual
Consider telecommunication through optical fibres. Which of the following statements is not true?
Options
- AOptical fibres can be of graded refractive index
- BOptical fibres are subjective to electromagnetic interference from outside
- COptical fibres have extremely low transmission loss
- DOptical fibres may have homogeneous core with a suitable cladding.
Correct answer
B. Optical fibres are subjective to electromagnetic interference from outside
Step-by-step solution
Some of the characteristics of an optical fibre are as follows. (i) This works on the principle of total internal reflection. (ii) It consists of core made up of glass/silica/plastic with refractive index n 1 , which is surrounded by a glass or plastic cladding with refractive index n 2 n 2 > n 1 . The refractive index of cladding can be either changing abruptly or gradually changing (Graded index fibre). (iii) There is a very little transmission loss through optical fibres. (iv) There is no interference from s