Download - REY DIAGRAMS for THIN LENSES
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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 now answer. (Slides 3,4)
2. Easy problem:
We have thin lens and an object. Where is the image located? Teacher to lead, adding questions for students, discuss. (Slide and animation 6)
3. Experiment:
Problem, students answer, computers answer. (Slide 7)
4. A few groups take a (simple) question. (Slides 8,9)
5. An answer. (Slide 10)
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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
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Focal point
FOCAL POINT CONVERGING LENS
HOW DOES RAYS DIRECTION AFTER REFRACTING ?
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Focal point
FOCAL POINT DIVERGING LENS
HOW DOES RAY TRACING AFTER REFRACTING AT THE LENS ?
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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
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2f f f 2f
Object
Image
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2f f f 2f
Object
Image
Eksperiment
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2f f f 2f
Object
Group 1 2 3
ObjectObject
T
6
Draw rays diagram and Image
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(2f) F2 F1 (2f)
Group 4 5
ObjectObject
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2f f f 2f
Group
T
6
A
T’
An answer…Author:Branislav JovanovicKragujevacE-mail: [email protected]: WINDOWS XP
Object(Point) Image(Point)