Question

Find the power of a concave lens of focal
length 50 cm
+ 0.02 D
+2 D.
O -2D
0 -0.02 D​

Answer 1

Answer:

-2 D

Explanation:

50cm=0.5m

focal length of concave lens is always negative

so, f = -0.5m

therefore, power =1/-0.5 = -2 D