Question

Describe the construction and working of
an optical fibre.​

Answer 1

$\large\boxed{\fcolorbox{blue}{yellow}{Answer:-}}$

$\huge\underline{\underline\mathtt{Construction:-}}$

An optical fibre is a sort of flexible 'light pipe' within which light is constrained to travel as a result of successive total internal reflections. An optical fibre consists of a transparent core filament surrounded by a plastic matrix called cladding The core has a diameter of few thousandths of a millimetre and is usually made of glass. The cladding has a refractive index lower than that of glass. Each composite filament, called an optical fibre, is very flexible and an optical transmission line is made up of a bundle of such optical fibres enclosed in a protective plastic jacket.

$\huge\underline{\underline\mathtt{Working:-}}$

Because the refractive index of the core is more than that of the cladding, light travels along the core by total internal reflections if it strikes the interface between the core and the cladding at an angle of incidence more than the critical angle.