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Total Internal Reflection. Using Optical Fibres. Total Internal Reflection. Total internal reflection occurs when the angle of incidence is greater than the critical angle. Light is travelling from less dense substance (glass) to less dense substance (air). Optical Fibre.

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total internal reflection

Total Internal Reflection

Using Optical Fibres

total internal reflection1
Total Internal Reflection

Total internal reflection occurs when the angle of incidence is greater than the critical angle. Light is travelling from less dense substance (glass) to less dense substance (air)

optical fibre
Optical Fibre

Total internal reflection in an optical fibre

optical fibres
Optical Fibres

Light enters each fibre at a large angle of incidence….greater than the critical angle.

Light is then totally internally reflected, until it leaves the end.

Optical fibres are used in hospitals, in endoscopes.

There are used in communications, for transmitting information

They are also used in lighting, such as Christmas displays

optical fibres in christmas trees
Optical Fibres in Christmas Trees

Optical fibres in a Christmas Tree.

The fibres are thin, so that light can only enter at a large angle of incidence.

Lght is totally internally reflected along each fibre

There is a rotating coloured disc in the base

The disc contains filters of different colours

As the disc rotates different colours are sent along the optical fibres.