GKFix MCQ Question

In the lens maker's formula, 1/f = (n-1)(1/R1 - 1/R2), what does 'n' represent?

• A. The speed of light in the lens material
• B. The refractive index of the surrounding medium relative to the lens material
• C. The refractive index of the lens material relative to the surrounding medium
• D. The wavelength of light in the lens material