Ray diagram showing an object, convex lens, p-ray, c-ray, and f-ray.

11. Draw an object next to a convex lens with a p-ray, c-ray, and f-ray going through the lens. You can choose the location on where the object is -- just don't put it between the focal point and lens (no real image will form). Make sure your p-ray and f-ray go through their focal points, and make sure your c- ray is straight. See more