The power of a lens is 4.0 diopters and its diameter is 5.0 cm.What is the focal length of this lens?
A)25 cm
B)55 cm
C)10 cm
D)0.25 cm
E)2.5 cm

Name: The power of a lens is 4.0 diopters and its diameter is 5.0 cm.What is the focal length of this lens? A)25 cm B)55 cm C)10 cm D)0.25 cm E)2.5 cm
Brand: Quizplus
Rating: 4.9 (30 reviews)

Question

Quizplus · Accepted Answer

The focal length of a lens is given by the formula: 
f = 1/diopters
Substituting the given values, we get:
f = 1/4.0 = 0.25 meters = 25 cm. 
Therefore, the focal length of the lens is 25 cm.

The Power of a Lens Is 4