In this lab, we are going to make an eyeball model using a balloon. This experiment should give you a better idea of how your eyes work. The way your brain actually sees things is still a mystery, but using the balloon we can get a good working model of how light gets to your brain.
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Yes it’s a double convex lens, the same kind as from a handheld magnifier.
Is a lense from an old pair of glasses biconvex?