GKFix MCQ Question

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)