- #1
dorado29
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Homework Statement
A 2.0 cm tall object is placed in front of a mirror. A 1.0 cm tall upright image is formed behind the mirror, 165 from the object
Homework Equations
1/s + 1/s' = 1/focal length
h' / h = magnification
-s' / s = magnification
h' / h = s' / s (i found this online so I'm not sure if it's correct)
The Attempt at a Solution
I'm pretty sure the question is saying the total distance from the object to the object's image is 165cm so:
s' + s = 165cm
s' = 165cm - s
then i plugged that into h'/h = s'/s
1cm/2cm = (165cm - s)/s and solved for s and got 110 cm so distance from object to mirror is 110 cm and distance from mirror to image is 55 cm
then i did 1/s+1/s'=1/f and solved for f
1/110cm + 1/55cm =1/f and got f=36.6cm. This was incorrect, so now I'm not sure what I should try