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What is the Lens Maker's Formula for a thin lens in a medium with refractive index n_medium?
A. 1/f = (n_lens - 1)(1/R1 - 1/R2)
B. 1/f = (n_lens / n_medium - 1)(1/R1 - 1/R2)
C. 1/f = n_lens (1/R1 - 1/R2)
D. 1/f = (n_medium - n_lens)(1/R1 - 1/R2)
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