What are endoscopes used for
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What are endoscopes used for?. TOTAL INTERNAL REFLECTION. TIR occurs in optical fibres , these are used in endoscopes. Inside Glass. Optical fibres are made of pure glass They are flexible Light is reflected when it strikes the inside surface of the fibre.

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Total internal reflection

TOTAL INTERNAL REFLECTION

TIR occurs in optical fibres , these are used in endoscopes.


Inside glass
Inside Glass

  • Optical fibres are made of pure glass

  • They are flexible

  • Light is reflected when it strikes the inside surface of the fibre


When a ray of light enters a glass block at an angle other than the normal it changes speed, wavelength and direction

In going from a less dense medium (air) to a more dense medium (glass) light bends towards the normal.


When a light ray emerges from glass into air it is refracted and bends away from the normal so i r

When a light ray emerges from glass into air it is than the refracted and bends away from the normal, so i < r.

When i equals the critical angle, the refracted ray is just touching the glass surface.

Glass critical angle: 42 degrees


TIR can occur in prisms and optical fibres