Question

an object is placed in front of a convex mirror radius of curvature 20cm. Its image formed 8cm behind the mirror. find distance of object from mirror

Answer 1

first find focal length using
R=2f
then use mirror formula
1/f=1/v+1/u
distance of image is given which is v we have to find distance of object which is u.
put the values and you will get distance of object but be sure of sign convention