12 एक उत्तल लेंस की40sentimeter hai /lens ki chamta ki gadana kijiye
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Explanation:
एक उत्तल लेंस की फोकस दूरी=40cm
क्षमता होगी =
P= 100/f. ( f is focus distance/
P= 100/40
P= 2.5cm
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