- #1
Suavez
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Homework Statement
A 2.0-cm-diameter spider is 1.80 m from a wall.
A. Determine the focal length of a lens that will make a half-size image of the spider on the wall.
B. Determine the position (measured from the wall) of a lens that will make a half-size image of the spider on the wall.
Homework Equations
(1/p) + (1/q) = (1/f)
m = (-q/p)
The Attempt at a Solution
I couldn't figure out where to start. I understand that the magnification should be (-.05) but then I can't use that equation because I don't know the original focal length. Would 1.80 m be the image distance? I wish the problem would have provided more information!