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  • (i) Name the phenomenon on which the working of an optical fibre is based. (ii) What are the necessary conditions for this phenomenon to occur? (iii) Draw a labelled diagram of an optical fibre and show how light propagates through

(i) Name the phenomenon on which the working of an optical fibre is based.

(ii) What are the necessary conditions for this phenomenon to occur?

(iii) Draw a labelled diagram of an optical fibre and show how light propagates through the optical fibre using this phenomenon.

 

 

 

 
 
 
 
 

Answers (1)

(i) Optical fibre works on the principle of total internal reflection.

(ii) Conditions for total internal reflection.

  • the light should travel from the denser medium to rarer medium.
  • the angle of incidence in the rarer medium should be greater than the critical angle.

(iii)

    

 

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