Exam-style question
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What is the relationship between optical power (P) and focal length (f) of a lens?.
- A.P = 1 / f
- B.P = f
- C.P = f^2
- D.P = 2f
Model answer
What a good answer should say
- P = 1 / f
Explanation
Why this works
The formula for optical power is P = 1 / f, where P is the power in diopters and f is the focal length in meters. This shows that power is inversely proportional to focal length.
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