A bi-convex lens made of glass (refractive index 1.5) is put in a liquid of refractive index 1.7. Its focal length will

Flint glass lens is made of refractive index 1.5. When it is placed in a liquid of refractive index 1.25, then its focal length will be ....

A convex lens made up of glass of refractive index 1.5 is dipped,in turn ,in medium A of refractive index 1.65. will it behave as converging or diverging lens?

A convex lens of refrative index 1.5 is immersed in a liquid of refractive index: 1.5. what changes happen to the focal length of the lens in the three cases?