An extended object of size 2mm is placed on the principal axis of a converging lens of focal length 10cm. It is found that when the object is placed perpendicular to the principal axis the image formed is 4mm in size. The size of image when it is placed along the principal axis is `"____________"` mm.

Answer

8

Explanation

When object is placed perpendicular to the principal axis, image size `=mxx(` object size)
or `4=mxx2rArrm=2`
When object is placed along principal axis,
image size`=m^(2)` (object size) `=4xx2=8mm`