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Q. एक उत्तल लेंस की क्षमता डायोप्टर है, इसकी फोकस दुरी होगी ?

(A) 24 सेमी
(B) 50 सेमी
(C) 40 सेमी
(D) 100 सेमी
Correct Answer - Option(B) Science

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