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HW #5, Due Sep. 28

HW #5, Due Sep. 28. Ch. 3: P7, P9, P10, P15, PH5. Reading Assignment For Next Week: Ch.4. REMINDER Exam I: Tuesday Oct. 3 Covers Chapters 1,2,3. Lecture 10 (chapter 3 continued). Quick Review: Ray rules for concave mirrors Finding the image Lenses This Lecture:

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HW #5, Due Sep. 28

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  1. HW #5, Due Sep. 28 Ch. 3: P7, P9, P10, P15, PH5 Reading Assignment For Next Week: Ch.4 REMINDER Exam I: Tuesday Oct. 3 Covers Chapters 1,2,3

  2. Lecture 10 (chapter 3 continued) • Quick Review: • Ray rules for concave mirrors • Finding the image • Lenses • This Lecture: • Ray Rules for Converging and Diverging Lenses • Image Formation • Magnification, etc.

  3. Spherical Lenses

  4. Refraction at Curved Surfaces R I axis O C center n2 n1 Simply apply the laws of refraction

  5. I R axis O C center n2 n1

  6. Thin Spherical Lenses Converging Lens: focal length (f) is positive R1 R2 The focal length f depends on curvatures (R1 and R2) and the index of refraction (n) of the material (glass).

  7. Thin Spherical Lenses Converging Lens: focal length (f) is negative

  8. Examples of Converging and Diverging Lenses * Lens Action (Many Applets) http://microscopy.fsu.edu/primer/lightandcolor/javalens.html http://www.techxhome.com/lightsite/optics/lenses/principleRays.html principle rays

  9. Ray Rules for Converging (and Diverging) Lenses Ray Rule 1: All rays incident parallel to the axis are deflected through F’ (or as if it came from F’) Ray Rule 2: All rays passing through the center of the lens Continue undeviated. Ray Rule 3: All rays that (when extended, if necessary) pass through F are deflected parallel to the axis.

  10. Example: Ray Rules for a converging lens | | F F’ | | F F’ | | F F’ f f= focal length

  11. Power of a Lens in diopters in meters * Lens Action (Many Applets) http://microscopy.fsu.edu/primer/lightandcolor/javalens.html http://www.techxhome.com/lightsite/optics/lenses/principleRays.html principle rays

  12. Spheres as Thick Lenses • Examples: • Water droplets (dew) • Glass beads • ..

  13. Dew Heiligenschein: The Holy Light ! Heiligenschein (German for halo) occurs when sunlight falls on nearly spherical dew drops and refracted back toward the sun in the same direction as it enters. It appears as bright white light around the shadow of your head on a dew-covered lawn.

  14. Glass Beads as Retroreflectors Scotchlite

  15. Fresnel Lenses

  16. Lens Aberrations Chromatic http://www.techxhome.com/lightsite/optics/lenses/chromAberr.html

  17. Spherical Aberration

  18. *Thick Lens (Spherical Aberration) http://www.cbu.edu/%7Ejvarrian/applets/lens3/thickl_z.htm http://www.techxhome.com/lightsite/optics/mirrors/mirrorAberr.html

  19. Curvature, Coma

  20. Astigmatism

  21. Distortion

  22. *Thick Lens (Spherical Aberration) http://www.cbu.edu/%7Ejvarrian/applets/lens3/thickl_z.htm http://www.techxhome.com/lightsite/optics/mirrors/mirrorAberr.html NEXT: CHAPTER 4 *Magnification (Magnifying Glass) http://microscopy.fsu.edu/primer/java/microscopy/simplemagnification/index.html

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