Recall that if one chapter makes 30 sturdy pairs, then 10,000 kids can play with one pair for an hour each year. This single device could be borrowed by every middle school science teacher in 10 schools each year, thus being seen by all 10,000 middle school students. To do these exercises, to bounce a ray off a spherical surface. This can be easily done if you know the location of the center of arc. The center of the arc is the small circle shown below.
Focal point Extend and reflect the four rays and see where they meet.
Real image Find the image of the pig using rays from the center of the pig.