1. 13.1 Lenses

2. Predicting Images in a Convex Lens

5. The Principal rays A ray parallel to the principal axis is refracted through the principal focus (F ).

6. The Principal rays A ray through the optical centre (O) continues straight through without being refracted.

7. Ray diagram when the OBJECT is beyond 2F S- Smaller A- Inverted L- between F and 2F T- real

8. Ray diagram when the OBJECT is AT 2F S- same size A- inverted L- on 2F T- real

9. Ray diagram when thE OBJECT is BETWEEN 2F and F S- larger A- Inverted L- beyond 2F T- real

10. Ray diagram when the image is AT F No Image

11. Ray diagram when the image is between F and O S- larger A- upright L- between 2F’ and F’ T- virtual

12. http://www.physics-chemistry-interactive-flash- animation.com/optics_interactive/converging_lens_con vex_positive.htm

13. Predicting Images in a Concave Lens

14. Any incident ray parallel to the principal axis will refract as if it had passed through the principal Focus. Concave Lens Characteristic Rays

15. Any incident ray passing through the Optical Centre will pass unrefracted (straight through).

16. Concave Lenses All Cases S- smaller A- upright L- in front of F T- virtual

17. Homework Pg. 561 #2, 3, 5, 6, 8