Question

How is the sign convention diferent in concave and convex mirrors? How to avoid mistakes in numericals related to the mirror formula?

Answer 1

Sign in the case of a convex mirror: 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 theconvex mirror, so sign of radius of curvature and focal length are taken as + (positive) in the case of convex mirror.

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