Question Detail
Question
When calculating the power of a lens using the formula Power = 1/focal length, the focal length must be expressed in which units?
Correct Answer
Option C is the correct answer.
Detailed Explanation
The document clearly states, "Note that the units of focal length must be in meters when using this expression."
Hint
Pay attention to the specific unit required for focal length when calculating lens power to ensure the result is in dioptres.