Question

where should an object be placed from a converging lens of focal length 15 cm, so as to obtain a real image of same size as that of the object.

Answer 1

At a distance of 30 cm on the left side of the lens (At 2F) the object should be placed to get a real and same size image.

Answer 2

the object should be placed at c
C=2F
C=2×15
object=30cm
Therefore object should be placed at 30cm from the mirror
Hope it helps
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