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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)
When a semiconductor is doped with a P-type impurity, each impurity atom will (A) Acquire negative charge. (B) Acquire positive charge. (C) Remain
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State Gauss divergence theorem in vector calculus?
A rigid object is a body with a exact and unchanged size and shape i.e. a body is said to be rigid if the distance among any two particles of the body remains invariant.
what are like and unlike parallel force?
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Q. A Plano-convex lens of radius 3 m is placed on a flat glass plate and is illuminated by monochromatic light. The radius of the 8th dark ring is 3.6 mm. Calculate the wavelength
A lead bullet moves horizontally with a velocity of 130 ms-1 and embedded into a cement wall after collision. If the specific heat capacity of lead = 130 JKg-1°C-1 and all heat pro
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