29 Diameter of a plano convex lens is 6 cm and its thickness

Last updated: 6/8/2023

29 Diameter of a plano convex lens is 6 cm and its thickness at the centre is 3 mm Then the focal length of the lens if the speed of light in the material of lens is 2 x 108 m s 1 7 5 cm 3 45 cm 2 15 cm 4 30 cm