Question

2 2) what is the different between the principal focus of the
concave and convex Minor​

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

Answer 2

Answer:

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concave mirror use for seing large images