The Lens of a Slide Projector Has a Focal Length

Multiple Choice

The lens of a slide projector has a focal length of 10.0 cm. It is used to project the image of a 35 mm slide (24 mm × 36 mm) onto a square screen located 6.0 m away. Of the following screen widths, which is the smallest that would allow the entire image to fit?

A) 5.1 m
B) 4.4 m
C) 2.2 m
D) 1.1 m
E) 0.88 m