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The lens maker's formula makes 1/f proportional to
A(n+1)(1/R1 + 1/R2)
B(n-1)(1/R1 - 1/R2)
C(n-1)(R1 + R2)
Dn(R1 - R2)/(n-1)
Answer & Solution
Correct answer: B. (n-1)(1/R1 - 1/R2)
Focal length depends on how much the refractive index exceeds that of the surroundings and on the difference of the two surface curvatures.
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