Question

A convex mirror forms an image of half the size of the object. When it is moved 15cm away from the object the size of the image becomes 2/5times that of the object. Find the focal length of mirror

Answer 1

a convex mirror forms an image half of the size of the object when it is moved 15 cm from the object the size of the image becomes to upon 5 times of the object find the focal length