Question

total internal reflection and its applications

Answer 1

Total  Internal reflection :

   It is the phenomenon of light rays getting reflected back, when light rays from a denser medium are incident at the interface with a lighter medium at an angle greater than their critical angle.

Applications:
     Mirages in deserts or on hot roads at noon on summer days,  transmission of telecommunication signals through fiber optic cables, decorative optical fiber vases. 

   Total internal reflection phenomenon is used in cameras also.  Diamonds shine by this.  In total internal reflection, energy of light rays is not lost.  So in telecommunications the signals travel very far in optical fibers.

Answer 2

Answer:

Total internal reflection:

when angle of incidence if greater than the critical angle, the light ray is reflected into the denser medium at interface. This phenomenon is known as total internal reflection.

Applications of total internal reflection:

i) Brilliancy of diamonds: Total internal reflection is the main reason for brilliance of diamond. The critical angle of a diamond is is very low (24.4 degree). So if a light ray enters a diamond it is is very likely to undergo total internal reflection which makes the diamond shine.

ii)Optical fibres: Total internal reflection is the basic principle behind working of Optical fibre. An Optical fibre is very thin fibre made of glass (or) plastic having radius about a micrometre (10^-6m). A bunch of search thin fibres from a light pipe.

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