Question

What do you understand by the focus of a lens ? How will you find the focus on a convex lens ?​

Answer 1

Answer:

* The focus is the point, or plane, at which light rays from infinity converge after passing through a lens and traveling a distance of one focal length. In a refactor the first lens through which light from a celestial object passes is called the objective lens.

* 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.

Answer 2

Answer:

Focus of a lens is a point on the principal axis where all the light rays (parallel to principal axis) meets or appears to meet after refraction.

Explanation:

The image describes an activity to find the focus