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ICSE Class 10 Answered

Please explain with the help of a ray diagram:-
  • An optical fibre is used to transmit a light signal over a long distance without the loss of energy. However some energy gets lost due to absorption of light in its material.
Asked by Vandana | 21 Jun, 2017, 08:46: PM
answered-by-expert Expert Answer
It is true that an optical fibre is used for long distance transmission. An optical fibre is made up of materials of different refractive indices. The core is of higher refractive index than the cladding. When light is incident on the core, it gets refracted at the boundary of core-cladding. Therefore, depending on the angle a part of the light gets refracted outside and major chunk gets totally internally reflected. Hence, the cumulative effect over large distances is that there is loss of light energy due to refraction through the cladding.
Answered by Romal Bhansali | 20 Dec, 2017, 12:01: PM

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