A) \[{{10}^{-2}}m\]
B) \[{{10}^{-4}}m\]
C) \[{{10}^{-8}}m\]
D) \[{{10}^{-10}}m\]
Correct Answer: B
Solution :
[b] The diameter of the core in an optical fibre is nearly \[{{10}^{-4}}m\].
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