72 In order to obtain a real image of magnification 2 using

Last updated: 6/8/2023

72 In order to obtain a real image of magnification 2 using a converging lens of focal length 20 cm where should an object be placed a 50 cm c 50 cm b 30 cm d 30 cm 73 The radius of the convex surface of plano convex lens is 20 cm and the refractive index of the material of the lens ah of the lens is