We use two light rays to construct a ray diagram, so it is easy to know their directions after refraction from the lens. List the two rays and state the ray’s path after refraction. Use them to locate the image of an object between f and 2f of a convex lens.

We use two light rays to construct a ray diagram, so it is easy to know their directions after refraction from the lens. List the two rays and state the ray’s path after refraction. Use them to locate the image of an object between f and 2f of a convex lens.