Question

The image of an object formed by a convex lens of of the same size as the object. If the image formed at a distance of 40cm, find the focal length of the lens. Also , find the power of the lens. At what distance from the lens is the object placed?


Please it's urgent!

Answer 1

Answer:

Same size of image is formed by a convex lens only when the object is placed at a distance u=2f from the optical center and image is also formed at distance 2f on other side of lens.