The diameter of a plano convex lens is `6 cm` and thickness at the centre is `3 mm`. If the speed of light in the material of the lens is `2 xx 10^8 m//s`, what is the focal length of the lens ?

Diameter of plano-convex lens is 6 cm and thickness at the centre is 3mm. If speed of light in material of lens is 2 x 10^8 m/s, the focal length of the lens is

A plano - convex lens has diameter 5 cm and its thickness at the centre is 0.25 cm . If the speed of light inside the lens is 2xx10^(8)ms^(-1) , then what is the focal length (in cm) of the lens?

Diameter or aperture of a plano - convex lens is 6 cm and its thickness at the center is 3 mm. The image of an object formed is real and twice the size of the object. If the speed of light in the material of the lens is 2xx10^(8)ms^(-1) . The distance where the object is placed from the plano - convex lens is .............. xx15cm .

Diameter of the flat surface of a circular plano-convex lens is 6 cm and thickness at the centre is 3 mm. The radius of curvature of the curved part is

The radius of curvature of convex surface of piano convex lens is 10 cm and its focal length is 30 cm, then the refractive index of the material of the lens is

A plano - convex lens is made of flint glass. Its focal length is