Q.

Which of the following has more distortion?

A. single step-index fibre
B. graded index fibre
C. multimode step-index fibre
D. glass fibre
Answer» C. multimode step-index fibre
Explanation: when rays travel through longer distances there will be some difference in reflected angles. hence high angle rays arrive later than low angle rays. therefore the signal pulses are broadened thereby results in a distorted output.
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