A convex lens of power 4D is placed at a distance of 40cm from the wall. At what distance from the lens should a candle be placed. So that it's image is formed on the wall

A convex lens of power 4D is placed at a distance of 40cm from the wal

1.	A convex lens of power 4D is placed at a distance of 40cm from the wall. At what distance from the lens should a candle be placed. So that it's image is formed on the wall
Answer» P=1/f=1/4 v=-40cm U=? 1/f=1/v-1/u 1/4=1/-40-1/u u=-3.2

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A convex lens of power 4D is placed at a distance of 40cm from the wall. At what distance from the lens should a candle be placed. So that it's image is formed on the wall

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