एक उत्तल लेंस की फोकस दूरी 40 से.मी. हैं। लेंस की क्षमता की गणना कीजिए?
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Explanation:
(p)=1/f
(p)=1/40cm
(p)=1/0.4m
(p)=10/4
(p)=2.5D
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