(a) An object 37.5 cm in front of a certain lens is imaged 8.20 cm in front of that lens (on the same side as the object). What type of lens is this, and what is its focal length? Is the image real or virtual?
(b) If the image were located, instead, 44.5 cm in front of the lens, what type of lens would it is and what focal length would it have?