Diameter of a plano-convex lens is 6cm its thickness at the centre is 3mm. Then the focal length of the lens, if the speed of light in the material of lens is 2 times 10^8 m//s

Diameter of a plano-convex lens is 6cm its thickness at the centre is

1.	Diameter of a plano-convex lens is 6cm its thickness at the centre is 3mm. Then the focal length of the lens, if the speed of light in the material of lens is 2 times 10^8 m//s
Answer» 7.5cm 15cm 45cm 30cm Answer :D