question_answer 54)

  An unsymmetrical double convex thin lens forms the image of a point object on its axis. Will the position of the image change if the lens is reversed ?

Answer:

                  No, the position of image will not change if the lens is reversed. This is because in the lens maker's formula:                 i.e., on reversing the lens, values of R1 and R2 are reversed and so are their signs. Hence, for given u (position of object), position of image () remains unaffected.