What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A) +2.7 diopters
B) -2.5 diopters
C) +0.20 diopters
D) +2.5 diopters
E) +20 diopters

Question

Quizplus · Accepted Answer

The power of a lens (P) is given by the formula P = 1/f, where f is the focal length in meters. Converting 40 cm to meters gives 0.4 m. Therefore, P = 1/0.4 = 2.5 diopters. The positive sign indicates a converging lens.

What Is the Power of the Lens That Has a Focal