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24 Geometric Optics

24 Geometric Optics. Water drop as a converging lens. Reflection at a Plane Surface. Image and Object Rays diverging from one point P (object) recombine at point P’ by mirror or lens— an image formed. Object & Image Distances. Object distance Image distance Real image Virtual image

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24 Geometric Optics

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  1. 24 Geometric Optics Water drop as a converging lens

  2. Reflection at a Plane Surface Image and Object Rays diverging from one point P (object) recombine at point P’ by mirror or lens— an image formed.

  3. Object & Image Distances • Object distance • Image distance • Real image • Virtual image • Magnification

  4. Sign Rules s: The (real) object distance is positive. (The distance is negative for a virtual object.) s’: The image distance (s’) is positive for all real images and negative for virtual images. y and y’: Heights are positive if measured upward from the principal axis and negative if measured downward. m: Magnification is positive if the image is erect and negative when inverted. f: The focal length is positive for converging mirrors and lenses, and negative for diverging ones.

  5. Reflection at a Spherical Surface Mirror Equation

  6. Focal Point & Focal Length-Concave

  7. Image Construction—Concave

  8. Focal Point & Focal Length-Convex

  9. Image Construction—Convex

  10. Image Construction—Principal Rays

  11. Image Construction—Practice

  12. Refraction at a Spherical Surface

  13. How Deep is the Pool?

  14. Thin Lenses—Converging

  15. Thin Lenses—Diverging

  16. Thin-Lens Equations

  17. Imaging thru Thin –Lens: Principal Rays http://www.mtholyoke.edu/~mpeterso/classes/phys301/geomopti/lenses.html

  18. Principal Rays: Practice

  19. Summary: Reflection at a Plane Surface

  20. Summary: Reflection at a Spherical Surface

  21. Summary: Graphical Methods for Mirrors

  22. Summary: Refraction at a Spherical Surface & Thin Lenses

  23. Summary: Graphical Methods for Lenses

  24. Example: The Eye’s Lens The least distance of distinct vision (LDDV): 25 cm ~ 10 in

  25. Mirror/Lens Equation

  26. Homework Ch24 Answers to multiple choice problems

  27. quiz • Construct the images using principal rays for a converging lens and a convex mirror, respectively. • Find the locations of images using lens/mirror equation (f = +5 or -5 cm, s = 8 cm).

  28. Test 3 Grade Distribution # of Students: 30 Average: 12.8=64%

  29. Test 3 Grade Distribution # of Students: 21 Average: 11.7=59%

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