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A convex lens of power 4 D is placed at ...

A convex lens of power 4 D is placed at a distance of 40 cm from a wall . At what distance from the lens should a candle be placed so that its image is formed on the wall ?

Text Solution

Verified by Experts

`f=1/p =2/(4D) =1/4 m=25 cm`, v=40 m P=4D , u=40 cm.
`therefore 1/v -1/u =1/f implies 1/u=1/v -1/f =1/(40) -1/(25) =(5-8)/(200)=-(3)/(200)`
`therefore u=-(200)/(3)` cm.
So candle should be placed `(200)/(3)` cm from the lens.
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