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A camera is supplied with two interchangeable lenses, whose focal lengths are 36.0 and 140.0 mm....

A camera is supplied with two interchangeable lenses, whose focal lengths are 36.0 and 140.0 mm. A woman whose height is 1.75 m stands 7.50 m in front of the camera. What is the height (including sign) of her image on the image sensor, as produced by (a) the 36.0-mm lens and (b) the 140.0-mm lens? Answer has to be in m!

please explain, when i did this i got for a)6.75E-3 m and b) -.0266 m and it was wrong.

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