A candle is placed in 15.0 cm in front of a convex mirror. When the convex mirror is replaced by a plane mirror, the image moves back 7.00 cm (further away from the mirror). Find the focal length of the convex mirror.
From convex mirror equation we know that,
1/f = 1/d0 + ...
Solution shows the brief steps to calculate the focal length of a convex mirror in the given circumstances.