A 10 D lens is placed in contact with a 15 D lens.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 placed in contact, we can find the refractive power of the combination by adding the individual powers of the lenses. 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. Hence, the best choice is B.

A 10 D Lens Is Placed in Contact with a 15