The distance between the convex lens or a concave mirror and the focal point of a lens or mirror is called the focal length. Focal length can be positive or negative. A lens is a piece of transparent glass which concentrates or disperses light rays when passing through them by refraction. In this article, let us know how to find the focal length of a concave lens using a convex lens.

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Ans: The focal length of a lens is defined as the distance between the optical centre and the principal focus of the lens.