A convergent lens of 6 diopters is combined with a diverging lens of -2 diopters. Find the power of combination?

4 diopter 6 diopter 8 diopter 10 diopter

4 diopter

Here P1 = 6 diopters, P2 = -2 diopters Using the formula P = P1 + P2 = 6 – 2 = 4 diopters