For a thin lens, lens-maker's formula:
A1/f = (n - 1)(1/R₁ - 1/R₂)
Bf = R₁ + R₂
Cf = n R
D1/f = n R
Answer & Solution
Correct answer: A. 1/f = (n - 1)(1/R₁ - 1/R₂)
1/f = (n - 1)(1/R₁ - 1/R₂). R is positive if surface is convex toward incoming light. Determines focal length of thin lens from radii of curvature and material refractive index.
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