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hardwork
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Homework Statement
An object is in front of a lens with a focal length of -15cm. An image ½ the side of the object is formed. How far is the object from the lens?
Homework Equations
m - magnification
q - distance from image
p - distance from object
f - focal length
m = -q/p
1/p + 1/q = 1/f
The Attempt at a Solution
m = -q/p so q = -(1/2)p
1/p + 1/q = 1/f
1/p + 1/(-1/2p) = 1/-15cm
-1/p = 1/-15cm
p = 15 cm