Question

With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.

Answer 1

If we place an object anywhere between optical center and infinity, then the refraction occurs as in the below diagram:

 

It is clear in the above ray diagram that the refracted rays meet a point within the focus.  And also, this image virtual,erect and smaller than the object.
​Thus, if an object is viewed through a concave lens, its image is appeared smaller and closer than the object.