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an alien firefly, a tiny bio-luminescent (light emitting)critter is held in place in front of an...

an alien firefly, a tiny bio-luminescent (light emitting)critter is held in place in front of an ideal lens of focal length of f=84cm. the distance between the fireflt and the vertex of the lens is s=31cm . find the magnification of the image seen by an observed on the other side of the lens

express your answer to 3 decimal places and show work

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