There are three rules about how the light will go after the convex glass. The parallel ray will be refracted to go through the focus and ray going through the focus will be refracted to be parallel. And the ray passing through the origin will keep its direction.
There are three rules about how the light will go after the convex glass. The parallel ray will be refracted to go through the focus and ray going through the focus will be refracted to be parallel. And the ray passing through the origin will keep its direction.