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meermeeronthewall
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Homework Statement
An object and its lens-produced real image are 2.4 m apart.
Part A
If the lens has 55-cm focal length, what are the possible values for the object distance?
Express your answer using two significant figures.
Homework Equations
1/s+1/s'=1/f
s-s'=2.4m
The Attempt at a Solution
1/s+1/(s-2.4)=1/.55
2s-2.4/s^2-2.4s=1/.55
s^2-3.5s+1.32=0
I then used the quadratic formula and found:
s=3.07 and s=.4299
I tried this answer, but it is wrong. I also tried substituting s'=2.4+s. But the answers I got for that were wrong as well.
Nevermind, I solved it. I had to use s-(-s')=2.4.
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