Give Some Applications Of Total Interval Reflection?

Some of the applications of total internal reflections are as follows:

- Periscopes and binoculars: it is constructed using two right-angled prisms. The light rays hit the inside surface of the prisms at angles greater than the critical angle. The light rays are therefore internally reflected.

The binoculars also make use of prisms to reduce the length of the instruments and to produce an erect image. Take note that the light rays in a pair of binoculars are bent through 180 degrees by each prism in contrast to the periscope where light rays are only bent through 90 degrees by each prism.

- Optical fibres: A very important application of total internal reflection can be found in optical fibres. An optical fiber is made of a core of high refractive index glass or plastic. It is normally coated with glass of lower refractive index. A light ray introduced into the optical fiber will be internally reflected at the surfaces. Even though the optical fiber may be bent, the light will still be internally reflected.

Optical fibres are now widely used in telecommunications industries. They can carry much more information than copper wires. They are also lighter and are becoming cheaper to manufacture than copper wires.