What are optical fibres? How do they work?

1.	What are optical fibres? How do they work?
Answer» An optical fibre is very thin fibre made of glass or plastic having radius about a micrometer. A bunch of such thin fibres forms a light pipe. Working : 1. Because of the small radius of the fibre, light going into it makes a nearly glancing incidence on the wall. 2. The angle of incidence is greater than the critical angle and hence total internal reflection takes place. 3. The light is thus transmitted along the fibre.

Answer»

An optical fibre is very thin fibre made of glass or plastic having radius about a micrometer.

A bunch of such thin fibres forms a light pipe.

Working :

1. Because of the small radius of the fibre, light going into it makes a nearly glancing incidence on the wall.

2. The angle of incidence is greater than the critical angle and hence total internal reflection takes place.

3. The light is thus transmitted along the fibre.

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