The power of a lens is 4.0 diopters. What is the focal length of this lens?
A) 25 cm
B) 55 cm
C) 40 cm
D) 20 cm
E) 60 cm

Name: The power of a lens is 4.0 diopters. What is the focal length of this lens? A) 25 cm B) 55 cm C) 40 cm D) 20 cm E) 60 cm
Brand: Quizplus
Rating: 4.8 (40 reviews)

Question

Quizplus · Accepted Answer

The power of a lens is given by the equation P = 1/f, where P is the power in diopters and f is the focal length in meters. Therefore, the focal length of a lens with a power of 4.0 diopters is 1/4.0 = 0.25 meters, or 25 centimeters.

The Power of a Lens Is 4