The radius of curvature of eithr face of a conex lens is equal to ts focal length .What is the refractive index of its material?

Find the radius of curvature of the convex surface of a plano convex lens,whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5/

The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm, Its focal length is 12 cm. What is the refractive index of the glass ?

The radii of curvature of the faces of a double convex lens are 20 cm and 30 cm. Its focal length is 24 cm. What is the refractive index of the glass?

The radius of curvature of a convex mirror is 40 cm what is its focal length?

The radius of curvature of each face of a biconcave lens made of glass of refractive index 1.5 is 30 cm. Calculate the focal length of the lens is air.

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

Power of a lens is -5d, its focal length is: