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

Two identical glass (mu_(g)=3//2) equiconvex lenses of focal length f are kept ini contact. The space between the two lenses is filled with water (mu_(w)=4//3) . The focal length of the combination is

Two identical glass (mu_(g)=3//2) equiconvex lenses of focal length f are kept ini contact. The space between the two lenses is filled with water (mu_(w)=4//3) . The focal length of the combination is

Two identical glass (mu_g=3//2) equiconvex lenses of focal length of each are kept in contact.The space between the two lenses in filled with water (mu_w=4//3) The focal length of the combination is .

Two identical glass (mu_(g)=3//2) equi- convex lenses of focal length f each are kept in contact. The space between the two lenses is also filled with water (mu_(g)=4//3). The focal length of the combination is

Two identical glass (mu_(g)=3//2) equi- convex lenses of focal length f each are kept in contact. The space between the two lenses aiisolfilled with water (mu_(g)=4//3). The focal length of the combination is

Two identical glass (mu_(g)=3//2) equi- convex lenses of focal length f each are kept in contact. The space between the two lenses aiisolfilled with water (mu_(g)=4//3). The focal length of the combination is