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Q. |
What is the principle of fibre optical communication? |
A. | frequency modulation |
B. | population inversion |
C. | total internal reflection |
D. | doppler effect |
Answer» C. total internal reflection | |
Explanation: in optical fibres, the light entering the fibre does not encounter any new surfaces, but repeatedly they hit the same surface. the reason for confining the light beam inside the fibres is the total internal reflection. |
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