Question

97.A planoconvex lens of refractive index 1.5 and radious of curvature 30 cm ,is silvered at the curved surface. Now this lens has been used to form the image of an object.At what distance from this lens an object be placed in order to have a real image of the size of the object a)20 cm b)30 cm c)60 cm d)80 cm

Answer 1