Question

Suppose that a convex lens has a 40.0 cm focal length. Where must the object be placed in order for the image to be the same size as the object?​

Answer 1

Answer:

the object should be placed 80cm away from the lens

Explanation:

In a convex lens if we want to get an image of same size as the object it should be placed at the centre of curvature

here

f=40cn

R=2*40

=80