A positive lens with focal point ”f” are used to image an object according to the figure below. For what distances ”a”(expressed in ”f”) can we get with the following characteristics;

A positive lens with focal point ”f” are used to image an object according to the figure below. For what distances ”a”(expressed in ”f”) can we get with the following characteristics; a) Up- and down, smaller and real. b) Upright, enlarged ...