The refractive index of a material of a plano concave lens is 5//3 the radius of curvature is 0.3m. The focal length of the lens in air is

The refractive index of a material of a plano concave lens is 5//3 the

1.	The refractive index of a material of a plano concave lens is 5//3 the radius of curvature is 0.3m. The focal length of the lens in air is
Answer» `-0.45 m` `-0.6m` `-0.75m` `-1.0m` ANSWER :A