Two lenses with refractive powers of 10 D and 15 D are placed in contact. What is the refractive power of the combination?
A) 15 D
B) 25 D
C) 0.67 D
D) 5.0 D
E) 1.5 D

Question

Quizplus · Accepted Answer

When two lenses are in contact, the combined refractive power is the sum of the individual refractive powers. Therefore, the refractive power of the combination of a 10 D lens and a 15 D lens would be 10 D + 15 D = 25 D.

Two Lenses with Refractive Powers of 10 D and 15