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GATE ECE 1993 | Question-28

An optical fiber consists of a cylindrical dielectric rod of refractive index $\mathrm{n}^{1}$, surrounded by another dielectric of refractive index $n^{2}$, where $n^{2}$

  1. $i \geq \sin ^{-1} \sqrt{n_{1}^{2}-n_{2}^{2}}$
  2. $i<\sin ^{-1} \sqrt{n_{1}-n_{2}}$
  3. $i \geq \sin ^{-1} \sqrt{n_{1}^{2}-n_{2}^{2}}$
  4. $i=\sin ^{-1} \sqrt{n_{1}-n_{2}}$

     

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