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

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

Diameter of a plano-convex lens is 6cm and thickness at the centre is 3mm. If speed of light in material of lens is 2xx10^(8)(m)/(s) , The focal length of the lens is

Diameter of a plano-convex lens is 6cm and thickness at the centre is 3mm. If speed of light in material of lens is 2xx10^(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?

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?