Answer:
Magnification= \[1\] i.e., image is inverted and of same size. It means, object is at 2F and image is also at 2F.
Therefore, distance between u and v = 4f = 60 cm.
f = 60/4 = 15 cm
Object will be at = 2f = 30 cm.
If the object is shifted towards the lens by 20 cm, the new object distance will be at 10 cm from the lens. This distance is less than the focal length, so the image formed in this case would be virtual, erect and on the same side.
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