284CHAPTER 23 23.32Comparing the given equation to the thin lens equation, 111pqf+=, we see that the lens is a convergent lens ()0f>with focal length 7.50 cmf=. Also, the image distance is negative ()3.50q= −p, meaning the image is virtual. The lateral magnification is 3.50qppp−= +3.50M= −= −so the image is upright and enlarged. (a) Using the information deduced above, the thin lens equation becomes 1113.507.50 cmpp−=giving ()17.50 cm15.36 cm3.50=−= +p(b) The image distance is then ()3.505.36 cm18.8 cmq= −= −(c) See the ray diagram at the right. (d) A simple magnifier is a device that uses a convergent lens to form an upright, enlarged, virtual image of a real
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