Question

Difine the principal focus of convex mirror

Answer 1

For convex lens , the first focal point is a point f1 on the principal axis of tye lens such that the ray of light coming from it after refraction through the lens become parallel to the principal axis of the lens . .... this is principal foci

Answer 2

For convex lens, the first focal point is a point
f1 on the principal axis of type lens such that the ray of light coming from it after refraction through the lens become parallel to the principal axis of the...... this is principal foci