Question Detail
Question
The power of a lens is defined as the reciprocal of its focal length. For this expression, what unit must the focal length be in for the power to be in diopters?
Correct Answer
Option C is the correct answer.
Detailed Explanation
The text states, "Note that the units of focal length must be in meters when using this expression."
Hint
Recall the standard unit for focal length when calculating lens power, usually expressed in diopters.