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Spherical lenses

Spherical lenses. Spherical lenses. Spherical lenses. Thin , converging lenses: The rules. Section of a spherical surface with large radius of curvature R 2. Section of a spherical surface with large radius of curvature R 1. Thin, converging lenses. Thin, converging lenses.

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Spherical lenses

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  1. Spherical lenses

  2. Spherical lenses

  3. Spherical lenses

  4. Thin, converging lenses: The rules Section of a spherical surface with large radius of curvature R2 Section of a spherical surface with large radius of curvature R1

  5. Thin, converging lenses

  6. Thin, converging lenses

  7. Thin, converging lenses A) Any incoming ray parallel to the lens's axis always goes through the focal point on the other side!

  8. Thin, converging lenses Example: light a fire. DEMO?

  9. Thin, converging lenses

  10. Thin, converging lenses B) Any ray coming in through the lens's focal point always goes out parallel to the lens’s axis.

  11. Thin, converging lenses Example: making a spotlight.

  12. Thin, converging lenses

  13. Thin, converging lenses C) Any ray aimed at the lens's center always goes through un-deflected!

  14. Thin, converging lenses: IMAGING

  15. Thin, converging lenses: IMAGING

  16. Thin, converging lenses: IMAGING

  17. Thin, converging lenses: IMAGING

  18. Thin, converging lenses: IMAGING

  19. Thin, converging lenses: IMAGING Our previous convention

  20. Example: An 0.5 m tall object stands 1.75 m in front of a converging lens (focal length 0.75 m). Where’s the image, and how big?

  21. Like the concave mirror, you get different behavior if the object is closer than f to the lens: Virtual, upright image on same side as object

  22. Like the concave mirror, you get different behavior if the object is closer than f to the lens: Virtual, upright image on same side as object

  23. Like the concave mirror, you get different behavior if the object is closer than f to the lens: Virtual, upright image on same side as object

  24. Like the concave mirror, you get different behavior if the object is closer than f to the lens: Virtual, upright image on same side as object

  25. Like the concave mirror, you get different behavior if the object is closer than f to the lens: Virtual, upright image on same side as object

  26. Thin, converging lens

  27. Example: An 0.05 m tall object stands .15 m in front of a converging lens (focal length 0.75 m). Where’s the image, and how big?

  28. SIM http://phet.colorado.edu/en/simulation/geometric-optics

  29. A Simple Camera: fixed focal length Shutter exposure film Aperture: Exposure Depth of field

  30. A Simple Camera: fixed focal length

  31. A Simple Camera: fixed focal length

  32. A Real Camera

  33. Thin, diverging lenses

  34. Thin, diverging lenses

  35. Thin, diverging lenses A) A ray coming in parallel to the lens's axis always goes out at an angle as if it where coming from the focal point on the incident side!

  36. Thin, diverging lenses

  37. Thin, diverging lenses B) A ray aimed at the lens's center always goes through un-deflected!

  38. Thin, diverging lenses: IMAGING

  39. Thin, diverging lenses: IMAGING

  40. Thin, diverging lenses: IMAGING

  41. Thin, diverging lenses: IMAGING

  42. Thin, diverging lenses: IMAGING

  43. Thin, diverging lenses: IMAGING

  44. Image on same side as object Image is upright Virtual now Fix it upto be the same formula as for the converging lens by making image and focal length negative!

  45. Thin, diverging lenses: IMAGING

  46. Example: An 0.5 m tall object stands 1.75 m in front of a diverging lens (focal length -0.75 m). Where’s the image, and how big?

  47. THIN LENS EQUATIONS: converging diverging Backwards from convention for mirrors

  48. Example: Compare virtual images from converging and diverging lenses 2 m O O I I 5 m 2 m 5 m

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