A) Optical fibres can be of graded refractive index
B) Optical fibres are subjected to electro- magnetic interference from outside
C) Optical fibres have extremely low transmission loss
D) Optical fibres may have homogeneous core with a suitable cladding
Correct Answer: C
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 stray electric and magnetic fields to the signals through optical fibres.
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