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in Physics by (121k points)
किसी खगोलीय दूरदर्शक (astronomical telescope) में लेंसों की क्षमता 0.5 डायोप्टर एवं २० डायोप्टर है | उसकी आवर्धन-क्षमता होगी
A. 50
B. 10
C. 100
D. 40

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