Name the physical principle on which the working of optical fibres is based.

(i) State the principle on which the working of an optical fiber is based. (ii) What are the necessary conditions for this phenomenon to occur ?

Optical fibre are based on

Name the principle on which it works.

Name the principle on which screw gauge works.

Advantage of optical fibre

The diameter of an optical fibre is

The principle involved in the working of Rocket is

The principle involved in the working of Rocket is

Mention any three uses of optical fibres.

Name the part of a cell in which a network of chromatin fibres occurs.