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एक 20 सेमी फोकस-दूरी वाले उत्तल लेंस के सम्मुख वस्तु कहाँ रखी जाए कि वस्तु का वास्तविक एवं दुगुना बड़ा प्रतिबिम्ब बने?

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एक 20 सेमी फोकस-दूरी वाले उत्तल लेंस के सम्मुख वस्तु कहाँ रखी जाए कि वस्तु का वास्तविक एवं दुगुना बड़ा प्रतिबिम्ब बने?
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Correct Answer - 30सेमी
f=20 सेमी , m=-2=`v/u` , v=-2u
`rArr 1/f=1/v-1/u`
`rArr 1/20=1/"-2u"-1/u`
`rArr 1/20=(-1-2)/"2u"`
`rArr (-3)/u=1/10`
`rArr u=-30` सेमी
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