Two identical glass $$(\mu_{g}=\frac{3}{2})$$ equiconvex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water $$(\mu_{w}=\frac{4}{3})$$. The focal length of the combination is

A

$$f$$

B

$$\frac{4f}{3}$$

C

$$\frac{3f}{4}$$

D

$$\frac{f}{3}$$