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frederickcan
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Homework Statement
A 2.0-cm-diameter spider is 3.0 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
thin-lens equation
1/f= 1/s + 1/s'
The Attempt at a Solution
(a) Used s and s' in the thin-lens equation to find the focal length:
1/2.0cm + 1/0.3cm = 3.83
f= 1/3.83 = .261cm
(b) .261/2 = .1305