Question

Observation table of ot find focal length of a concave lens using convex lens

Answer 1

by using lens formula you find focal length of a concave lens

Answer 2

Answer:

To determine focal length of a convex lens

Place the holder with the screen on the bench. The position of the screen should be such that the sharp image of the distant object is obtained on it. The difference between the position of the lens and the screen is equal to the focal length of the given convex lens.