A converging lens of focal length 20 cm ...

A converging lens of focal length 20 cm and diameter 5 cm is cut along the line AB . The part of the lens shown shaded in the diagram is now used to form an image of a point P placed 30 cm away from it on the line XY which is perpendicular to the plane of the lens. The image of P will be formed.

`0.5mm` above `XY`

`1mm` above `XY`

on `XY`

`1.5 mm` below `XY`

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The optic axis of a lens does not change even on cutting it.

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