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Geometric Optics vs. ‘the wave’

Geometric Optics vs. ‘the wave’. ‘plane’ traveling wave. ( Apple >> l ). A light ray: IN. Rough surface. A light ray: IN. Diffuse reflection:. A light ray: IN. Reflected light rays: OUT. Distinguishing Objects. Diffuse reflection. Diffuse reflection:. Diffuse reflection.

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Geometric Optics vs. ‘the wave’

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  1. Geometric Optics vs. ‘the wave’ ‘plane’ traveling wave

  2. ( Apple >> l )

  3. A light ray: IN

  4. Rough surface A light ray: IN Diffuse reflection:

  5. A light ray: IN Reflected light rays: OUT

  6. Distinguishing Objects Diffuse reflection

  7. Diffuse reflection: Diffuse reflection

  8. No focusing: Belly and nose undistinguishable!

  9. Use a lens to ‘focus’: Belly and nose distinguished !

  10. Use a lens to ‘focus’: Belly and nose distinguished !

  11. How to focus divergent light rays? Start: Use reflection off of smooth surfaces (mirrors) of special shapes. Flat mirror

  12. Flat mirrors and virtual images:

  13. Flat mirrors and virtual images:

  14. Flat mirrors and virtual images:

  15. Flat mirrors and virtual images: “Virtual” image !

  16. Flat mirrors and virtual images:

  17. CONCAVE Spherical mirrors

  18. ‘Focal length’ ?

  19. ‘Focal length’ ?

  20. ‘Focal length’ ?

  21. ‘Focal length’ ?

  22. ‘Focal length’ ?

  23. Where’s F ?

  24. Where’s F ?

  25. Where’s F ?

  26. Where is F ? • must • be “small”!

  27. Image ? Object

  28. Image ? Object

  29. Image ? Object

  30. Image ? Object Image

  31. Image ?

  32. Image ?

  33. Image ? Object Image

  34. Image ? Object Image

  35. Image ? Object Image

  36. For a concave mirror: InvertedReal Image Convention: m < 0 for inverted image!

  37. Example: A cute, baby chick is standing 10 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

  38. Example: A cute, baby chick is standing 10 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

  39. Example: Now, the cute, baby chick is standing 5 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

  40. Example: Now, the cute, baby chick is standing 5 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

  41. Example: Now, the cute, baby chick is standing 3 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

  42. Example: Now, the cute, baby chick is standing 3 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

  43. Example: Finally, the cute, baby chick is standing 1 ft in front of a concave mirror of radius 5 ft. Where is its image and how big? DEMO

  44. Example: Finally, the cute, baby chick is standing 1 ft in front of a concave mirror of radius 5 ft. Where is its image and how big? “Virtual” image ! DEMO

  45. CONVEX Spherical mirrors

  46. ‘Focal length’ ?

  47. ‘Focal length’ ?

  48. ‘Focal length’ ? • must • be small!

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