Question

image formation in covex lens

Answer 1

When the object is placed before the optical center and after the focus its virtual and erect..

Other than that in all cases the image formed is real and inverted..

Hope it HELPED..

Answer 2

when object is b/w f and o image is virtual.
when at f image at infinity.
when b/w f and 2f image is behind 2f'.
when at 2f image at 2f.
when behind 2f image b/w f' and 2f'.
when at infinity image at f'.