Question

The focal length of convex mirror is positive or negative??
Please explain a numerical with it​

Answer 1

Answer:

Since, object is always placed in front of the mirror hence the sign of object is taken as negative. Since, the centre of curvature and focus lies behind the convex mirror, so sign of radius of curvature and focal length are taken as + (positive) in the case of convex mirror.

Explanation:

PLEASE MARK ME AS A BRAINLIST

Answer 2

Answer:

Focal length of convex mirror and lens are always positive. Focal length of concave mirror and lens are always negative