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 4 cm long. What is the scale factor of the dilation? If the flea jumps 10 cm across the surface, how far does its image jump across the screen? Explain your reasoning.

Question

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 4 cm long.  What is the scale factor of the dilation? If the flea jumps 10 cm across the surface, how far does its image jump across the screen? Explain your reasoning.

anonymous · Answer

cm/0.2 cm is the ratio 20:1

That is, the flea’s shadow will be 20 times its actual size. If it jumps 10 cm on the lens, then its image will be 20 times that distance or 200 cm on the screen.

Note: 0.2 cm = 2 millimeters

anonymous · Answer

Okay thank you :)