1. REY DIAGRAMS for THIN LENSES
This is an example how teacher make presentation for students learning “REY DIAGRAMS” :
Evaluation previous students knowledge:
Various lens shapes. Converging and diverging lens. (Slide 2)
Focal point. Students nows answer. (Slides 3,4)
Small problem:
We have thin lens and an object. Where is the image located? Teacher to lead, adding qestions for students, discuss. (Slide and animation 6)
3. Experiment:
Small problem, students answer, coputers answer. (Slide 7)
4. A few groups take a (simple) question. (Slides 8,9)
5. An answer. (Slide 10)

2. Various thin lens shapes(nlens>nmedium):
Biconvex, plano-convex, concave-convex
1. Converging lenses,
2. Focal length>0,
3. Thickest at the middle
Biconcave, plano-concave, convex-concave
1. Diverging lenses,
2. Focal length < 0,
3. Thickest at the edges

3. FOCAL POINT CONVERGING LENS
HOW DOES RAYS DIRECTION AFTER REFRACTING ?
Focal point
FOCAL POINT CONVERGING LENS

4. Focal point HOW DOES RAY TRACING AFTER REFRACTING AT THE LENS ?
FOCAL POINT DIVERGING LENS

5. - R2 l p Glass, n>1 Vakuum, n=1 Object R1 C1 F1 F2 C2 Image f
Geometry for a thin lens

6. Object 2f f
Image

7. Eksperiment
Object 2f f
Image

8. Group 1 2 3 6
Object
Object
Object 2f f T
Draw rays diagram and Image

9. Group 4 5
Object
Object
(2f) F2 F1

10. 6 A answer… Group A T’ T 2f f Author:Branislav Jovanovic Kragujevac
Object(Point)
Image(Point) T’ 2f f T
Author:Branislav Jovanovic
Kragujevac
OS: WINDOWS XP(OR LATTER)
A answer…