rays diagram 1
DESCRIPTION
geometrical opticsTRANSCRIPT
REY DIAGRAMS for THIN LENSES
This is an example how teacher make presentation for students learning “REY DIAGRAMS” :
1. Evaluation students knowledge:• Various lens shapes. Converging and diverging lens. (Slide 2)
• Focal point. Students nows answer. (Slides 3,4)
2. 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)
Biconcave, plano-concave, convex-concave
Biconvex, plano-convex, concave-convex
Various thin lens shapes(nlens>nmedium):
1. Converging lenses, 2. Focal length>0,3. Thickest at the middle
1. Diverging lenses, 2. Focal length < 0,3. Thickest at the edges
Focal point
FOCAL POINT CONVERGING LENS
HOW DOES RAYS DIRECTION AFTER REFRACTING ?
Focal point
FOCAL POINT DIVERGING LENS
HOW DOES RAY TRACING AFTER REFRACTING AT THE LENS ?
R1Object
Image
f
lp
f
F1 F2
flp
111
21
11)1(
1
RRn
fGlass, n>1
Vakuum, n=1
C2
C1
- R2
Geometry for a thin lens
2f f f 2f
Object
Image
2f f f 2f
Object
Image
Eksperiment
2f f f 2f
Object
Group 1 2 3
ObjectObject
T
6
Draw rays diagram and Image
(2f) F2 F1 (2f)
Group 4 5
ObjectObject
2f f f 2f
Group
T
6
A
T’
A answer…Author: Branislav Jovanovicmail: [email protected]
Object(Point) Image(Point)