If the lens is equiconvex with radius R and is in air (n_air = 1), what is its focal length f_air? - OPTICS Quiz | GKFix.in

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If the lens is equiconvex with radius R and is in air (n_air = 1), what is its focal length f_air?

A. f_air = R / (n_lens - 1)
B. f_air = R / (2 * (n_lens - 1))
C. f_air = 2 * R / (n_lens - 1)
D. f_air = (n_lens - 1) * R / 2

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