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Physics 7C SS1 Lecture 5: Ray Optics

Physics 7C SS1 Lecture 5: Ray Optics. Images Lens Types & Ray Tracing. Review: Light at an Interface. Activity 8.6.3 & FNT 1. Incoming Ray. Air n = 1. Plastic prism n = 1.5. On entering the prism (first boundary), which way will the light bend? a) Up b) Down c) No bend.

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Physics 7C SS1 Lecture 5: Ray Optics

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  1. Physics 7C SS1Lecture 5: Ray Optics Images Lens Types & Ray Tracing

  2. Review: Light at an Interface • Activity 8.6.3 & FNT 1 Incoming Ray Air n = 1 Plastic prism n = 1.5 On entering the prism (first boundary), which way will the light bend? a) Up b) Down c) No bend

  3. Review: Light at an Interface • Activity 8.6.3 & FNT 1 Which Ray? Incoming Ray (a) (b) Air n = 1 Plastic prism n = 1.5 (c)

  4. Review: Light at an Interface • Activity 8.6.3 & FNT 1 Incoming Ray Plastic prism n = 1.5 On leaving the prism, which way will the light bend? a) Up b) Down c) No bend

  5. What phenomenon most completely describes what you are seeing? • Refraction • Convergence • Divergence • Total Internal Reflection • Snell’s Law

  6. What phenomenon most completely describes what you are seeing? • Refraction • Convergence • Divergence • Total Internal Reflection • Snell’s Law

  7. Quiz 2

  8. 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

  9. How will light emerge from the prism below? • Up • Down • Parallel • Bent inward (converge) • Bent outward (diverge) Incoming Rays

  10. How will light emerge from the prism below? • Up • Down • Parallel • Bent inward (converge) • Bent outward (diverge) Incoming Rays

  11. How will light emerge from the prism below? • Up • Down • Parallel • Bent inward (converge) • Bent outward (diverge) Incoming Rays

  12. How will light emerge from the prism below? • Up • Down • Parallel • Bent inward (converge) • Bent outward (diverge) Incoming Rays

  13. Parallel rays are uncommon…how do lenses work on regular objects?

  14. Diffuse reflection: rough surface reflects light in many directions. Still obeys law of reflection, just scatters at many different angles. Paper Even flat surfaces like paper are not smooth to visible light. A flashlight beam shining on paper can be seen from most angles, not just the one complimentary to the incident.

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

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

  17. What type of image does Ernie make? • Real • Virtual • Upright • Inverted • Bigger • Smaller Lens far away: He was inverted and real Lens close to him: He was upright and virtual

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

  19. Focal point, f c Where’s Ernie? o Object plane

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

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

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