Question

An object is placed in front of a screen and a convex lens is placed at a position such that the size of the image formed is 9 cm. When the lens is shifted through the a distance of 20 CM the size of the image becomes 1 cm. Find the focal length of the lens and size of the object.
(step by step explanation)​

Answer 1

Answer:

I don't know

Explanation:

I don't know if you have any questions