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A beamer contains a converging lens that magnifies the image of an LCD 3.8 times and projects it on a screen at a distance of

A beamer contains a converging lens that magnifies the image of an LCD 3.8 times and projects it on a screen at a distance of 6.5 m from the LCD. What is the focal length of the lens? Select the correct answer from the following list:

a) 10.7 dm
b) -31.5 dm
c) .107 m
d) -.315 m

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