Curved surfaces of a plano-convex lens of refractive index $$\mu_1$$ and a plano-concave lens of refractive index $$\mu_2$$ have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses.

A

$$\frac{1}{\mu_2 - \mu_1}$$

B

$$\frac{1}{\mu_1 - \mu_2}$$

C

$$\mu_2 - \mu_1$$

D

$$\mu_1 - \mu_2$$