Question

If the power of concave lens is 10D and that of a convex lens is 6D, then the power of combination

Answer 1

Answer:

-4 D

Explanation:

As we know that power of convex lens is +ve and the power of concave lens is -ve.

Then , power of convex lens = + 6D

Power of concave lens = -10 D

Therefore, power of combination = power of concave lens + power of convex lens

= -10D + 6 D = - 4D