Question

an object is placed within the focal length of the lens what will be the nature of the image​

Answer 1

it is crucial and it is dangerous

Answer 2

If it is a concave lens, the image will be virtual, erect, diminished and within optical centre and focus(on the other side of the object).

But, if it is a convex lens, the image will be virtual, erect, enlarged and on the same side of the object