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This question belongs to Electronics And Communications Engineering Optical Communication

Optical Communication

?

In an optical fibre, if the total internal reflection takes place, which of the following conditions have to be satisfied?

A) $${n_2} > {n_1}{\text{ and }}{\phi _1} > {\cos ^{ - 1}}\left( {\frac{{{n_2}}}{{{n_1}}}} \right)$$ B) $${n_2} < {n_1}{\text{ and }}{\phi _1} > {\cos ^{ - 1}}\left( {\frac{{{n_2}}}{{{n_1}}}} \right)$$ C) $${n_1} < {n_2}{\text{ and }}{\phi _1} < {\cos ^{ - 1}}\left( {\frac{{{n_2}}}{{{n_1}}}} \right)$$ D) $${n_1} > {n_2}{\text{ and }}{\phi _1} > {\cos ^{ - 1}}\left( {\frac{{{n_2}}}{{{n_1}}}} \right)$$

Answer & Solution

Correct Answer: Option B

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