Question

define the principal focus of a spherical lens ?​

Answer 1

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spherical lens------ it is a point on principal axis where light rays parallel to each othe and parallel to principal axis after refeaction either meet actually on other side(in case of convex lens or converging lens) or appears to meet o same side(incase of concavelens or divergimg lens) as that of object is called as principal focus of spherical lenses

Answer 2

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.

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