Mirror formula relating object distance u, image distance v, focal length f:
Au + v = 2f
Bu + v = f
Cu v = f²
D1/u + 1/v = 1/f
Answer & Solution
Correct answer: D. 1/u + 1/v = 1/f
1/v + 1/u = 1/f (sign convention: distances measured from pole, +ve along incoming light). Same form for thin lenses: 1/v - 1/u = 1/f.
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