Question

अपने विद्यालय प्रधानाचार्याकोरिक
Gormal Jetta 120 d
प्रमाण पत्र दिने कामशेषकररएका
प्रार्थना पत्र लिनिएतपायड मोबाइए कि
आपकोइसकी आवश्यकता कहे।​

Answer 1

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