Question

what do you understand by the focus of a lens?how will you find the focus of a convex lens?​

Answer 1

Answer:

The principal focus of a convex lens is defined as the point on which the principal axis of the light is parallel to the principal axis that converges after the refraction from the lens. The principal focus of the concave lens is when the light rays get diverged and appear to form a single point.

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Answer 2

Answer:

In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge

The principal focus of a convex lens is defined as the point on which the principal axis of the light is parallel to the principal axis that converges after the refraction from the lens. The principal focus of concave lens is when the light rays get diverged and appear to form a single point.

Explanation: