Question

$\huge\underline\mathtt\red{Question}$


If a convex lens of power +2 D is kept in contact with a concave lens of power -2 D, then the power of the combination will be:
a) 0 D
b) 4 D
c) -4 D​

Answer 1

Answer:

a.) 0D

As Combination of lens = 2-2=0D

Answer 2

a) 0 D

P = 2D + (-2D)

P = 2D -2D

P = 0D