[" A thin convex lens has two surfaces of radii of curvature "R" and "2R" .The material "],[" of the lens has a refractive index "mu." When kept in air,the focal length of lens "]

A thin concavo-convex lens has two surfaces of radii of curvature R and 2R. The material of the lens has a refractive index n. When kept in air, the focal length of the lens.

A thin concavo-convex lens has two surfaces of radii of curvature R and 2R. The material of the lens has a refractive index p. When kept in air, the focal length of the lens

The radii of curvature fo a lens are +20cm and +30cm . The material of lens has refractive index mu=(3)//(2) . Find fcal length of lens in air.

There is a thin double convex lens having surfaces of radius of curvature R and 2R. Lens is kept in air and refractive index of the material of the lens is mu . Focal length of the lens

A biconvex lens of radius of curvature 'R' is made up of the material of refractive index 'n'. Then the focal length 'f' of the lens in air is

A double convex lens has faces of radii of curvature 30 cm each. The refractive index of the material of the lens is 1.5. What is the focal length of this lens when immersed is carbondisulphide of refractive index 1.6 ?

The radius of curvature of a plano-convex lens is R. The refractive index of material of prism is n then find the focal length of the lens ?

A thin douel convex lens has surfaces of radii of curature 30 cm each.Find the refractive index of the material of lens,if the focal length is 25 cm.

The radii of curvature of a lens are + 20 cm and + 30 cm. The material of the lens has a refracting index 1-6. Find the focal length of the lens (a) if it is placed in air, and (b) if it is placed in water (mu = 1.33).