3. किसी गोलीय दर्पण की त्रिज्या 50 सेमी है, तो उसकी फोकस-दूरी होगी-
(A) 15 सेमी (B) 25 सेमी (C) 35 सेमी (D) 50 सेमी
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Answer:
B 25cm
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Answer:
25cm
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