A 1.67 m tall woman is standing 4.5 m in front of a convex (diver gins) mi or, and the non-inverted image formed is 0.5 m tall.\Find the focal distance and the radius of curvature of mirror.
A myopic (nearsighted) man has a far point of 120 cm. What poet contact lens (when on the eye) will correct his distant vision?