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Physics 7C SS1, Lecture 6: Ray Model

Physics 7C SS1, Lecture 6: Ray Model. Lenses & Images. Agenda. Quiz 2 Review Ray model: lenses and images Introduce Field model: Electric field and Force Analogies with gravitational field and force. Quiz 2. Lecture today should be…. Primarily about lenses More lenses than fields

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Physics 7C SS1, Lecture 6: Ray Model

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  1. Physics 7C SS1, Lecture 6: Ray Model Lenses & Images

  2. Agenda • Quiz 2 • Review Ray model: lenses and images • Introduce Field model: • Electric field and Force • Analogies with gravitational field and force

  3. Quiz 2

  4. Lecture today should be… • Primarily about lenses • More lenses than fields • Even between lenses and fields • More fields than lenses • Primarily about fields

  5. Every part of the tree reflects light, scattering it all directions. A ray diagram is used to simplify this picture.

  6. What type of image does Ernie make? • Real • Virtual • Upright • Inverted • Bigger • Smaller

  7. Focal point, f Image plane Image plane c Object plane o i

  8. Focal point, f c Image plane i o Object plane

  9. Where will the image be?How big will the image be?

  10. Concepts: Object Image Real Virtual Upright Inverted Magnification Focus Ways to locate Image: Thin Lens Equation Image distance Object distance Sign of lens Ray Tracing Principal Rays Lens Types: Converging Diverging Convex Concave Terms in Optics

  11. True/False: This is enough information to determine the focal point of the lens. If true, devise a procedure. If false, determine the minimal additional information necessary. Object Image plane Image c

  12. You place a tiny source of light at the focal point What happens? • Rays all bend through the far focal point • Rays emerge parallel • Rays travel straight (looks like diverge from the near focal point) • Something else

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