Choosing a Camera Lens the picture size on ordinary 35-mm camera film is 24 mm x 36 mm. Focal lengths of lenses available for 35-mm cameras typically include 28, 35, 50 (the ''normal'' lens), 85, 100, 135, 200, and 300 mm, among others. Which of these lenses should be used to photograph the following objects, assuming that the object is to fill most of the picture area?
(a) A building 240 m tall and 160 m wide at a distance of 600 m, and
(b) A mobile home 9.6 m in length at a distance of 40.0 m.