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tou wish to use a large convering lens with a focal length of 1 m to...

tou wish to use a large convering lens with a focal length of 1 m to project an image of a painting hanging on the wall onto the opposite wall. the walls are 9m apart.
a) if the magnification of the image is -6.71 how far from the painting must the lens be mounted?
b ) if the magnification of the image is -0.149 how far from the painting must the lens be mounted?
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