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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P=1/f=1/4 v=-40cm u=?
1/f=1/v-1/u
1/4=1/-40-1/u
u=-3.2
1/f=1/v-1/u
1/4=1/-40-1/u
u=-3.2
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