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REY DIAGRAMS for THIN LENSES

REY DIAGRAMS for THIN LENSES. This is an example how teacher make presentation for students learning “REY DIAGRAMS” : Evaluation students knowledge: Various lens shapes. Converging and diverging lens. (Slide 2) Focal point. Students now answer. (Slides 3,4) Easy problem:

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REY DIAGRAMS for THIN LENSES

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  1. REY DIAGRAMS for THIN LENSES This is an example how teacher make presentation for students learning “REY DIAGRAMS” : • Evaluation students knowledge: • Various lens shapes. Converging and diverging lens. (Slide 2) • Focal point. Students now answer. (Slides 3,4) • 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)

  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. HOW DOES RAYS DIRECTION AFTER REFRACTING ? Focal point FOCAL POINTCONVERGINGLENS

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

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

  6. 2f f f 2f Object Image

  7. Eksperiment 2f f f 2f Object Image

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

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

  10. T’ T 2f f f 2f Group 6 A Object(Point) Image(Point) Author:Branislav Jovanovic Kragujevac E-mail:mpskg@ptt.yu OS:WINDOWS XP An answer…

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