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The lens formula relating image distance v, object distance u and focal length f of a spherical lens is written as which expression?
A1/v − 1/u = 1/f
B1/v + 1/u = 1/f
C1/u − 1/v = 1/f
Dv − u = f
Answer & Solution
Correct answer: A. 1/v − 1/u = 1/f
1. The standard lens formula is $\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$.
2. The mirror-style sum form and the reversed form do not match the lens convention.
3. So option A is the correct lens formula.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 7 "Lenses", p.93_
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