A coordinate axis as shown below is kept infront of a converging lens at a distance $2 f$ from it where $f$ is the focal length of the lens, what is the approximate shapeof the image as seen by an observer on the other side of the lens at a distance $3 f$ from it. Assume that $x - axis$ is along the principle axis of the lens

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Solution

The correct option is C
When an object is placed at a distance of $2 f$ from the convex lens image, image formed is real, inverted and of same size.

For the given coordinate axis,
Image of $x -$ axis will not alter from original sense as $x -$ axis is principle axis of lens, while image of $y, z -$ axis are inverted

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