Question

Playing with An old lens one morning,raj discovers that if he holds the lens 10 cm away from a wall opposite to window, he can see a sharp but up side down picture of outside world on the wall.That evening he covers a lighted lamp with a piece of opaque paper on which he has pierced, a small hole 1mm in diameter by placing the lens between the illuminated card and the wall ,he manages to produce a sharp image of diameter 5mm on the wall
a) What is the power of the lens?
b) In the evening experiment, how far away from the opaque paper did he place the lens?
c) How far apart were the card and the wall?

Answer 1

Explanation:

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