Answer to Question #57428 in Optics for pawas

Question

A planoconvex lens is made of refractive index 1.5 . The radius of curvature of its spherical surface is 40cm . At what distance from the lens will a parallel beam of light will get focussed ? Draw a neat diagram to show the image formation from the lens . What will be the nature and power of a combination of two such lenses kept with their (a) - plane surfaces in contact. (b) - spherical surfaces in contact