1. Converging Lenses Section 4.6 Lesson 13

2. Lenses A lens is a thin transparent piece of glass or plastic that has at least one curved side –The sides can be concave, convex or both –We also use lenses for glasses! –https://www.youtube.com/watch?v=OydqR_7_DjI&list=TLHeswydtZnOv1sa2TF66 11HZItZiCuDBNhttps://www.youtube.com/watch?v=OydqR_7_DjI&list=TLHeswydtZnOv1sa2TF66 11HZItZiCuDBN

3. Lenses A lens changes the direction in which light –If the light rays come together it is a converging lens, if the rays move apart it is a diverging lens

4. Converging lens Because light can travel in both directions through a lens there are two focal points – one on either side of the lens

5. principal axis F1F1 F

6. Drawing Ray Diagrams Step 1 –Draw a straight line (the axis of symmetry) through the centre of the lens perpendicular to the principal axis –An incident ray drawn parallel to the principal axis will refract through the focus on the other side of the lens

7. principal axis For an object beyond 2F 1 F1F1 F 2F 1

8. Drawing Ray Diagrams Step 2 –Draw an incident ray through F 1 that will refract through the lens parallel to the principal axis

9. principal axis F1F1 F

10. Drawing Ray Diagrams Step 3 –An incident ray aimed at the centre of the lens will pass through the lens

11. principal axis F1F1 F

12. L: _____________ O: _____________ S: ____________ T: ________ closerinvertedsmallerreal Identify the characteristics of this image: F1F1 F

13. Notes Complete the handouts: –4.6 Converging Lenses: Drawing Ray Diagrams –4.6 What are lenses and what are some of their applications? (Summary)

14. Vocabulary Journal Add this term and definition: –lens