दूरसंचार के क्षेत्र में प्रयुक्त होती हैं- (A) अवरक्त तरंगें (B) पराबैंगनी तरंगें (C) माइक्रो तर...

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दूरसंचार के क्षेत्र में प्रयुक्त होती हैं-
(A) अवरक्त तरंगें
(B) पराबैंगनी तरंगें
(C) माइक्रो तरंगें
(D) दृश्य प्रकाश
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