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A point source of light is kept at a di...

A point source of light is kept at a distanceof`15cm`from a converging lens,on its optical axis.The focal length of the lens is`10cm`and its diameter is`2cm` ,A secreen is placed on the other side of the lens ,perpendicualr to the axis fo lens,at a distance`20cm`from it.Then find the area of the illuminated part of the screen?

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