Question

How to find the focal length of a lens for plano convex lens?

Answer 1

We can find the focal length of a convex lens by dividing radius of curvature by two. Thus we can find the focal length. Hope this helps you.
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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.