A typical human eye is nearly spherical and usually about 2.
5 cm in diameter.
Suppose a person first looks at a coin that is 2.
3 cm across and located 30.
0 cm from her eye and then looks up at her friend who is 1.
8 m tall and 3.
25 m away.
Find the approximate size of each image (coin and friend) on her retina.
(Hint: Just look at rays from the top and bottom of the object that pass through the center of the lens,)