Power of a convex lens of focal length 50 cm is:
A person has near point of his vision shifted to 50 cm. What lens must be used to see an object placed at 25 cm from the eye? What is the power of the lens?
Power of a convex lens of focal length 50cm is:
A person having myopic eyes uses a concave lens of focal length 50 cm. What is the power of the lens?