1. Converging Lenses & Their Application Dan Li SUNY-Stony Brook 11/07/2002

2. OUTLINE Thin Lenses Converging lenses Focal length & Geometric Construction Thin Lens Equation Applications Cameras Projector Simple Magnifier

3. What Are Thin Lenses? What Are They Used To do?

4. Focal Length Focal Point Focal Length Symbol: f Two Focal Point Two Focal Length Same Focal Length

5. Geometric Construction A ray passing through the center is un-deviated. A ray which is parallel to the principal axis of the lens will pass through the focal point after refraction.

6. Thin-lens Equation o: object distance i: image distance f: focal length M=-i/o : magnification

7. The Relation between Object & Image 1 Obj>2f f<Ima<2f -1<M<0 2 f 2f M<-1 3 0 1

8. Cameras

9. How Cameras Work

10. Projector

11. How Projector Works

12. Simple Magnifier

13. How Magnifier Works

14. More Applications

16. Thank you!