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Optical fibres and refraction

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by

Harvey Buckle

on 3 August 2018

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Transcript of Optical fibres and refraction

Optical fibres and refraction
Aim
To know how optical fibres work
To know how refraction happens
To know the laws of reflection
Light rays
All light waves, which hit the surface beyond this critical angle, are effectively trapped. The critical angle for most glass is about 42 °.
Optical fibres
An optical fibre is a thin rod of high-quality glass. Very little light is absorbed by the glass. Light getting in at one end undergoes repeated total internal reflection, even when the fibre is bent, and emerges at the other end.
Law of reflection
When light ray strikes a pl____ m____r, the a______ of i______ is e_____ to the ________ of _________.
Starter
Swap setas
Optical fibres
Waves going from a dense medium to a less dense medium speed up at the boundary. This causes light rays to bend when they pass from glass to air at an angle other than 90º. This is refraction.
Beyond a certain angle, called the critical angle, all the waves reflect back into the glass. We say that they are totally internally reflected.
Lets see
Watch Mr Havey
Uses of optical fibres
See page 323
Full transcript