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  4. An object is kept at a distance of 16 cm from a thin lens and the image formed is real. If the object is kept at a distance of 6 cm from the same lens the image formed is virtual. If the size of the images formed are equal, the focal length of the lens will be

Q. An object is kept at a distance of from a thin lens and the image formed is real. If the object is kept at a distance of from the same lens the image formed is virtual. If the size of the images formed are equal, the focal length of the lens will be

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Solution:

As the lens can form both real and virtual images,
it is a convex lens and
we get

And
and
As the images are of the same size

Or
Or
Or

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