For the lens setup shown, the lensmaker's formula relates 1/f to the radii R₁, R₂ and refractive index n. The formula is: 
A1/f = (n+1)R₁R₂
Bf = n(R₁ - R₂)
C1/f = n(R₁ + R₂)
D1/f = (n-1)(1/R₁ - 1/R₂)
Answer & Solution
Correct answer: D. 1/f = (n-1)(1/R₁ - 1/R₂)
Lensmaker's formula: 1/f = (n - 1)(1/R₁ - 1/R₂). Sign convention: R is positive if center of curvature is on the side of outgoing light. For convex lens in air: positive f.
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