The order of diameter of core of an optical fibre is \( \mathrm{P} ...

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The order of diameter of core of an optical fibre is
\( \mathrm{P} \) approximately equal to

W
(1) \( 10^{-2} \mathrm{~m} \)
(2) \( 10^{-6} \mathrm{~m} \)
(3) \( 10^{-9} \mathrm{~m} \)
(4) \( 10^{-12} \mathrm{~m} \)
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