Question

define term first focal point of convex lens​

Answer 1

Answer:

For a convex lens, the first focal point is a point F1 on the principal axis of the lens such that the rays of light starting from it or passing through it, after refraction through lens, become parallel to the principal axis of the lens.

Answer 2

Answer:

For a convex lens, the first focal point is a point F1 on the principal axis of thelens such that the rays of light starting from it or passing through it, after refraction through lens, become parallel to the principal axis of the lens.