A concave lens has a focal length of 50 cm. What is the power of the lens?
+0.2 D
+0.02 D
-0.02D
-0.01D
The power of a lens is given as :
P = 1f
Here, by sign convention, f = −50cm
So, P = -0.02 D
A person having myopic eyes uses a concave lens of focal length 50 cm. What is the power of the lens?
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?