Question: In optical fibres, if the total reflection is to take place, the following conditions must be satisfied______Where n<sub>1 </sub> and n<sub>2</sub> are respectively refractive indices of core and cladding and Φ<sub>1 </sub> is angle of incidence.
Answer:
MCQ: In optical fibres, if the total reflection is to take place, the following conditions must be satisfied______Where n<sub>1 </sub> and n<sub>2</sub> are respectively refractive indices of core and cladding and Φ<sub>1 </sub> is angle of incidence.
Correct Answer:
A. n<sub>2</sub> < n<sub>1 </sub> and Φ<sub>1 </sub>> cos<sup>-1 </sup>(n<sub>2 </sub>/ n<sub>1</sub>)
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