a flea is 0.2 cm long. as it walks across the glass surface of an overhead projector, its image on the screen appears to be 4cm long. what is the scale factor of the dilation? if the flea jumps 10cm across the glass surface, how far does its image jump across the screen?

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3?

yes, so your shadow is 4 times as big as you. so the scale factor between you and your shadow is 1:3

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