एक उत्तल लेन्स की फोकस दूर� – McqOptions

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1.	एक उत्तल लेन्स की फोकस दूरी 0.2 मीटर है । इसकी क्षमता होगी ?
A.	+2D
B.	- 2D
C.	- 4D
D.	+5D
Answer» E.

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