Exam-style question
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Describe how the optical power of a lens is related to its focal length.
Model answer
What a good answer should say
- The optical power (P) of a lens is inversely related to its focal length (f) and is given by the formula P = 1/f, where P is measured in diopters (D) and f in meters (m).
- A lens with a shorter focal length has a higher optical power, allowing it to bend light more sharply.
Explanation
Why this works
This answer effectively explains the relationship between optical power and focal length using the appropriate formula. It tests the student's ability to connect mathematical concepts with physical properties of lenses.
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