The focal lengtli of a equiconvex lens is `2/3` times the radius of curvature of the surface. What is the refractive index of the medium?

What is the refractive index of a medium?

On what factors does the refractive index of a medium depend?

The focal leght of a spherical mirror is 40 cm. What is its radius of curvature ?

If the focal length of a concave mirror be 15cm then what is its radius of curvature?

The refractive index of the material of a double equiconvex lens id 1.5. IF the radius of curvature of he lens is R, then its focal length 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?

When an object is placed 20 cm away from a convax lens, no image is obtained on either side of the lens. What is the focal length of the lens? If the refractive index of glass with respect to air is 1.5, what is the refractive index of air with respect to glass?

The radius of curvature of a concave mirror is 30 cm. What is its focal length ?

What is the relation between polarising angle i_(p) and refractive index mu of the medium?

If in a plano-convex lens, the radius of curvature of the convex surface is 10cm and the focal length of the lens is 30cm, then what is the refractive index of the material of lens ?