If a thin lens is dipped in water, does its focal length change ?

Assertion : When a convex lens (mu_(g) = 3//2) of focal length f is dipped in water, its focal length become (4)/(3)f Reason : The focal length of convex lens in water becomes 4f.

If the lens is placed in water instead of air, how does its focal length change?

Convex lens made up of glass (mu_(g)=1.5) and radius of curvature R is dipped into water. Its focal length will be (Refractice index of water =4/3)

A convex lens, made of glass, is immersed in water. As a result, its focal length will:

The focal length of a plano-concave lens is -10 cm , then its focal length when its palne surface is polished is

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

The dispersive power of the material of a lens is 0.04 and the focal length of the lens is 10cm . Find the difference in the focal length (in mm) of the lens for violet and red colour.

Focal length of a lens in air is f. Refractive index of the lens is mu . Focal length changes to f_(1) if lens is immersed in a liquid of refractive index (mu)/(2) and it becomes f_(2) if the lens is immersed in a liquid of refractive index 2 mu . Then

Which lens, thick or thin has greater focal length?