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Gear2d
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Homework Statement
A converging lens (convex lens) creates an image that is 2 times the size of the object. The object is placed:
Homework Equations
-di/do = hi/ho
1/f = 1/di + 1/do
The Attempt at a Solution
I thought the answer was that the object is place two focal lengths in front of the lens. But the answer says its half a focal length in front of the lens.
I mean: -di/do = hi/ho = 2
-di = 2do
1/f = 1/di + 1/do
= -1/2do + 1/do = 1/2do
f = 2do
Isn't f=2do saying two focal lengths?
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