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Lenses homework problem

by no idea
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no idea
#1
May19-04, 05:18 AM
P: 93
An object pin is placed 20cm in front of a convex lens which is 10 cm away from a plane mirror . An inverted image is found at the same position of the object(above the object).
What is the focal length?
thanks
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Doc Al
#2
May19-04, 08:49 AM
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Here are a few hints. Is the image formed by the lens real or virtual? What does a plane mirror do?

Figure out where the image would be if the mirror wasn't there.


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