Question

The film in a 35-mm camera has an area of 24mm x 36mm. The photographer wants to fill the frame with as much of the following objects as possible. In her kit bag she has lenses with focal lengths of 28, 35, 50, 85, 100, 135, 200, and 300mm. Which lenses should she choose? The objects being photographed are (a) a windmill 240m tall and 160m wide at a distance of 600m, and (b) a stretch limousine 9.6m in length at a distance of 40.0m.

Answer 1

wind mill son. Since film has area. 24mm x 36 mm. , if we take windmill. 240m. height on 36 mm side, the magnificationis , m2 310-3 = 2 810-4 the side of the image in the width af windmill be 16om wild. 24 x2 403 160m. [here ide]. Thena it will cover the - 3 810-4 let us and wore the image and object distance y = m = -3 x 10-4. [As image is invested] As per problem. u = -600 V = +600x 3.810-4 ,= 90 mm, focal length f = + = 10 + boom fe 600x90 89.96 mm. (600X163 +90-) lense f=85, 100 mm can be ched b) For limousine of length l= 9.6m, this length conte - tilmed on 36mm. side, hence magnification in m = -36410*3. =- 6x10m2, them Úz-€710-2 or 0=-40x6x10-2 = 0.15 focal length. (f = 0'15* 40 = 0.1494m., 135 mm lense 40 tois "I can be used