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How is plastic fibre material used in optical fibres?
Plastic fibre:
Plastic fibre is classically made of plastic. Such are low cost optical fibres. They have a huge NA and a huge refractive index variation among the core and cladding. Plastic fibre-optic cable consists of the highest attenuation; due to nature of the material they give larger signal attenuation than glass fibres. Though, this drawback is overcome by their durability and ruggedness. Plastic fibre-optic cable consists of a plastic core and plastic cladding.
Illustrations:
a. Polystyrene (core) – methylmethacrylate (cladding)
b. Polymethylmethacrylate (core) – copolymer (cladding)
The total number of neutrons in dipositive zinc ions with mass number 70 is: (1) 34 (2) 40 (3) 36 (4) 38 Ans:40
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