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Q.340 :  ऑप्टिकल फाइबर होता है?

(a) रेशमा का बना हुआ
(b) कांच का बना हुआ
(c) उपर्युक्त दोनों का
(d) इनमे से कोई नही
View Answer
Answer :कांच का बना हुआ

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