N3E10p13

Problem 13:

In photography class you learn that the ratio of the size of the image on the film to the object size is the same as the ratio of the distance from the object to the camera lens to the distance from the lens to the film.  How far from the camera lens must a flower be placed if the distance from lens to the film is 7 mm and the plant is .5 m tall?  The film you are using is 35 mm (35 mm x 35 mm).