The image of a flower on a 35-mm color slide is 2.00 mm high. It is to be projected onto a screen 5.00 m from the slide, and it is to appear 50.0 cm high. The focal length of the lens used is
O 1.99 m.
O 02.00 m.
O 02.01 m.
O 502 m.
O 498 m.