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: B
Solution :
| [b] Some of the characteristics of an optical fibre are as follows |
| [a] This works on the principle of total internal reflection. |
| [b] It consists of core made up of glass/silica/plastic with refractive index \[{{n}_{1}}\], Up 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). |
| [c] There is a little transmission loss through optical fibres. |
| [d] There is no interference from stray electric and magnetic fields to the signals through optical fibres. |
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