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How do you find the rough focal length of a convex lens? Is the same method applicable to a concave lens?

Asked by Topperlearning User 6th December 2013, 8:52 AM
Answered by Expert

The rough focal length of a convex lens is obtained by forming sharp image of a very distant object on a screen. The distance of the screen from the lens gives us the rough focal length of the lens.

This method is not applicable to a concave lens, as image formed by a concave lens is virtual and it cannot be taken on a screen.

Answered by Expert 6th December 2013, 10:52 AM
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