Four lenses are made from the same type of glass, the radius of curvature of each face is given below. Which will have the greatest positive power

Four wires made of the same material are stretched by the same load. Their dimensions are given below. Which one will be elongated most?

A plano-concave lens is made of glass (R.l. = 1.5) and the radius of curvature of the curved face is 50 cm. The power of the lens is

A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?

A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?

A plano-concave lens is made of glass (R.l. = 1.5) and the radius of curvature of the curved face is 50 cm. The power of the lens is

A plano-concave lens is made of glass of refractive index 1.5 an the radius of curvature of its curved surface is 50 cm. What is the power of the lens?

All the listed things below are made of flint glass. Which one of these have greatest dispersive power ( omega ).