The image above represents what happen when light refracts (or bends). The shape in the middle would be the lens, and the smaller cat on the left is the object, and the large cat on the right is the real image. The horizon line is the optic axis, where the two focal points sit. The green ray is the parallel ray, and travels from the object parallel to the optic axis then through the lens, and bends through the focal point on to the other side. The red ray, or the focal ray, travels from the object through the focal point on the object side, through the lens and then parallel to the optic axis. The blue ray is the central ray and travels from the object through the center of the lens, and then continues without bending. t a d a
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