A convex lens of power 4D is placed at a distance of 40 cm from a wall. At whatdistance from the lens should a candle be placed so that its image is formed on the
wall ?
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2
Explanation:
Given that the power of the lens, P= 4D
Therefore the focal length of the lens, f = 1/ 4 =0.25 m = 25 cm
Given that the image distance, v = 40 cm
According to lens formula:

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1
Answer:
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