[" On heating a liquid,the refractive index generally "],[[" (a) Decreases "," (b) Increases "],[" (c) Remain Constant "," (d) None of above "]]

If water is heated, how refractive index of will change?

If a convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens, then lens acts like a

A lens of refractive index n is put in a liquid of refractive index n' . If focal length of lens in air is f , its focal length in liquid will be.

A lens of refractive index n is put in a liquid of refractive index n' . If focal length of lens in air is f , its focal length in liquid will be.

A convex lens is dipped in a liquid, whose refractive index is equal to the refractive index of the lens. Then, its focal length will

A convex lens of focal length 20 cm in air is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Now the focal length will be