एक उत्तल लेंस की फोकस दूरी 40 सेंटीमीटर है लेंस की क्षमता की गणना कीजिए
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Explanation:
Given,
Lens =40cm
f=?
We know that
Lens =1/f
. Lens=1/40
. . Lens=0.08D
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