A plano convex lens has a thickness of 6cm. Its radius of curvature is 25 cm. When its curved surface is kept on a horizontal surface and viewed from the top, its bottom appears to be raised by 2 cm. The focal power of lens is

A plano convex lens a thickness of 4 cm. Its radius of curvature is 20 cm, When its curved surface is kept on a horizontal surface and viewed from the top, its bottom appears to be raised by 1 cm. The focal length of the lens is

A plano-convex lens has refractive index 1.6 and radius of curvature 60 cm. What is the focal length of the lens?

A plano-convex lens has refractive index 1.6 and radius of curvature 60 cm. What is the focal length of the lens?

A plano-convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is

A plano convex lens (n = 1.5) and radius of curvature 20 cm is silvered at the curved surface. What is the power of the system ?

A plano-convex lens is made of glass of refractive index 1.6. the radius of curvature of its curved surface is 30 cm. What is the focal length of the lens ?

A plano-convex lens is made of refractive index 1.6.If the radius of curvature of the curved surface is 60 cm,then focal length of the lens is:

A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is