The outside mirror on the passenger side of a car is convexand has a focal lengt

Question

The outside mirror on the passenger side of a car is convexand has a focal length of -5.1 cm. Relative to this mirror, a trucktraveling in the rear has an object distance of 17 m. Find(a) the image distance and (a)the magnification of the mirror. I got a value of -3.937 for the distance and 0.231 for themagnification but it is still wrong for some reason after re-doingthe math The outside mirror on the passenger side of a car is convexand has a focal length of -5.1 cm. Relative to this mirror, a trucktraveling in the rear has an object distance of 17 m. Find(a) the image distance and (a)the magnification of the mirror. I got a value of -3.937 for the distance and 0.231 for themagnification but it is still wrong for some reason after re-doingthe math

Explanation / Answer

f = 5.1 cm = .051 m do = 17 m Using the following formulas from chapter 25: 1/f - 1/do=1/di -(di/do) =magnification I get numbers somewhat like yours if I don't convert the focallength of the mirror to meters first. And I see your input numbersare different from the cramster solution. Because the truck is 34xas far as the focal length, di should benearly at the focal point.

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