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Question #89048
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Question
In the Lens Maker's Formula, 1/f = (n2/n1 - 1)(1/R1 - 1/R2), what does 'n1' usually represent?
A. Refractive index of the lens material
B. Refractive index of vacuum
C. Refractive index of the surrounding medium
D. Numerical aperture
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