Explain whether power of a lens will be more in air of water?

Whether the power of a lens will be more in air or in water?

Define power of a lens

What is power of lens? Give commercial unit of power?

The unit of power of lens is…… .

…is the unit of power of the lens

A convex lens is made of glass of refractive index 1.5.If radius of curvature of the each of its twosurfaces is 20 cm,find the ratio of the power of the lens,when placed in air to its power ,when immersed inside a liquid of refractive index 1.25.

A convex lens is made of glass of refractive index 1.5. If radius of curvature of the each of its two surfaces is 20 cm, find the ratio of power , of lens when placed in air to its power, when immersed inside a liquid of refractive index 1.25 .

Define 1 dioptre of power of a lens

Define 1 dioptre of power of a lens