Question

concave lens always forms virtual images when object is placed at any point on principal axis .why ?​

Answer 1

Answer:

Hi viewer, we know that virtual image will be formed by a concave lens because when the object is placed in front of concave lens the rays of the image will be diverged and these rays will be extended back . So we get the image as virtual and erect diminished.

Answer 2

Explanation:

concave lens always forms virtual images when object is placed at any point on principal axis . because a lens( made by joining the the part of two spherical surface) that is thinner In the middle than at the edges .it diverges the incidents (parallel) rays away from its principal axis.