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