Using the thin-lens formula 1/f = (n - 1)(1/R1 - 1/R2) for a symmetric bi-convex lens with R1 = +12 cm, R2 = -12 cm, n = 1.50, what is the focal length f?

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Using the thin-lens formula 1/f = (n - 1)(1/R1 - 1/R2) for a symmetric bi-convex lens with R1 = +12 cm, R2 = -12 cm, n = 1.50, what is the focal length f?

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