1. Lenses Lenses are curved surfaces that refract light as it passes through. [http://www.ast.cam.ac.uk/~optics/dazle/photos/finished_lenses/lenses_1_to_4_1.jpg]

2. Convex Lenses Thicker in the middle than at the edges Bends light toward the middle. (Focal Point!) [http://www.bbc.co.uk/scotland/education/bitesize/standard/img/physics/waves/convex_lens.gif]

3. Can correct farsightedness. [http://www.schools.net.au/edu/lesson_ideas/optics/images/optic_hyperopia.gif]

4. Convex Lenses Can be used to create magnified virtual images. Object must be less than 1 focal length away [http://sol.sci.uop.edu/~jfalward/physics17/chapter12/magnifier2.jpg]

5. Convex Lens Ray Diagram Object Distance < 1 focal length away from lens Virtual Image: Magnified & Upright

6. Convex Lenses Can create real images if the object is > 1 focal length away. [http://gpc.edu/~pgore/PhysicalScience/ray_diagram_sample.jpg] ObjectReal Image Click for Images Demonstration

7. Convex Lens Ray Diagram Object Distance > 1 focal length away from lens Real Image: Upside Down (But Size Varies!)

8. Concave Lenses Thicker on the edges than they are in the middle. Bends light outward (no focal point!) [http://www.bbc.co.uk/scotland/education/bitesize/standard/img/physics/waves/convex_lens.gif]

9. Can correct nearsightedness. [http://www.schools.net.au/edu/lesson_ideas/optics/images/optic_hyperopia.gif]

10. Concave Lenses Creates only a smaller virtual image. [http://sol.sci.uop.edu/~jfalward/physics17/chapter12/magnifier2.jpg]

11. Concave Lens Ray Diagram Object Located Anywhere Virtual Image: Smaller & Upright