Check sibling questions

(c) In an optical fibre, if n 1 and n 2 are the refractive indices of the core and cladding, then which among the following, would be a correct equation? 

(i) n 1 < n 2  

(ii) n 1  = n 2  

(iii) n 1 << n 2

(iv) n 1 > n 2

Answer

Optical Fibres work on the principle of total internal reflection

The main conditions for total internal reflection are:

  • Light should travel from denser to rarer medium.
  • Angle of incidence should be greater than critical angle

Therefore, 

The refractive index of the core is greater than the refractive index of the cladding.  

APPLICATIONS OF TIR- OPTICAL FIBERS.jpg

So the correct answer is (iv)

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.