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

A point source of light is kept at a distance of `15cm` from a converging lens,on its optical axis.The focal length of the lens is `10cm` and its diameter is `3cm` ,A screen is placed on the other side of the lens ,perpendicular to the axis of lens,at a distance `20cm` from it.Then find the area of the illuminated part of the screen?

`pi/4cm^2`

`pi/6cm^2`

`pi/2cm^2`

`pi/3cm^2`

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