physics
posted by rick .
A camera is supplied with two interchangeable lenses, whose focal lengths are 35.0 and 150.0 mm. A woman whose height is 1.80 m stands 7.00 m in front of the camera. What is the height (including sign) of her image on the film, as produced by
(a) the 35.0mm lens
(b) the 150.0mm lens?

You can use the lens equation to find (given fo, objectdistance) image distance.
Then, use the magnification equation to find image height (di/do=hi/di)
http://glenbrook.k12.il.us/GBSSCI/PHYS/Class/refrn/u14l5f.html
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