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HW #3, Due Sep. 14. Chapter 2 P23, P24, PH13, PH15, PM2. Undergraduate Research Opportunity. Positions are available for undergraduate students to work on optics related research or educational projects. Sponsored by UNM/NASA PURSUE Program
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HW #3, Due Sep. 14 Chapter 2 P23, P24, PH13, PH15, PM2
Undergraduate Research Opportunity Positions are available for undergraduate students to work on optics related research or educational projects. Sponsored by UNM/NASA PURSUE Program $8/hour 15 hour/week Anyone who is interested should contact me ASAP.
Lecture 7 (chapter 2 continued) • Quick Review: • Refraction • Total Internal Reflection • This Lecture: • Refraction in Nature (Mirages, Halos, Rainbows,..) • Chapter 3 (Lenses and Mirrors)?
*Refraction 1 http://microscopy.fsu.edu/primer/java/refraction/index.html http://wigner.byu.edu/LightRefract/LightRefract.html http://www.techxhome.com/lightsite/optics/refraction/boyFish.html Fish Tank
Examples Material Refractive Index (n) Air 1.0003 Water 1.33 Glycerin 1.47 Immersion Oil 1.515 Glass 1.52 Flint 1.66 Zircon 1.92 Diamond 2.42 Silicon 4
N i I n1 Air (for example) glass or water or … n2 R r Law of Refraction • The Refracted ray (R ) lies in the plane defined by Incidence ray (I) and surface Normal (N) • The Refracted ray (R ) lies on the opposite side of N as the incident ray I, and • The Refracted ray (R ) makes an angle r that satisfies the Snell’s law: Angle of Incidence Index of refraction in medium 1 almost equals to Angle of Refraction Index of refraction in medium 2 (for small angles)
Snell’s Law (exact) c a Sine of an angle
Total Internal Reflection *Total Internal Reflection (Optical Fiber) http://www.techxhome.com/lightsite/optics/refraction/fiberOptic.html
Prisms as perfect reflectors: See Fig. 2.56 in the Text
Diamond Brilliance (TIR), Fire (dispersion) and Flash
Next Refraction in Nature Mirages, Rainbows, Halos, Sun Dogs….
sunset MiragesandAtmospheric Distortions mirage
Dispersion Refractive Index varies with Wavelength : n() Dispersion in a prism * Prism Refraction http://microscopy.fsu.edu/primer/java/prism/index.html http://www.techxhome.com/lightsite/optics/refraction/monoPrism.html refraction & refl. http://www.techxhome.com/lightsite/optics/dispersion/whitePrism.html dispersion
Rainbow *Rainbow http://www.phy.ntnu.edu.tw/java/Rainbow/rainbow.html http://www.techxhome.com/lightsite/optics/dispersion/raindrop.html rain drop
Chapter 3Mirrors and Lenses Read 3.1, 3.2, 3.3 (A, B, C* , D), 3.4, 3.5** * Anamorphic Art ** Aberrations
Flat mirror revisited virtual image Read Text about the Kaleidoscope
Spherical Mirrors Where is the image? What is the field of view? Ray Tracing (simply apply the law of reflection)
Reflection in Curved Mirrors Convex and Concave Mirrors
F focal point axis O C center Paraxial Rays: Rays that are close to the axis
Ray Rules for a Convex Mirror Ray Rule 1: All rays incident parallel to the axis are reflected so that they appear to be coming form the the focal point, F. Ray Rule 2: All rays that (when extended) pass through center C are reflected back to themselves. Ray Rule 3: All rays that (when extended) pass through F are reflected back parallel to the axis.
3 1 O C F O C F 2 O C F
Locating the Image Mirrors *Concave Mirrors http://www.techxhome.com/lightsite/optics/mirrors/sphereMirror.html *Concave Lens: virtual image *Convex Mirrors http://www.techxhome.com/lightsite/optics/mirrors/mirrorAberr.html spherical aberration
M. C. Escher, “Hand with Reflecting Globe” Fig 3.9
Concave Mirror axis O C F center focal point
Ray Rules for a Concave Mirror Ray Rule 1: All rays incident parallel to the axis are reflected so that they appear to be coming form the the focal point, F. Ray Rule 2: All rays that (when extended) pass through center C are reflected back to themselves. Ray Rule 3: All rays that (when extended) pass through F are reflected back parallel to the axis.
*Concave Mirrors http://www.techxhome.com/lightsite/optics/mirrors/sphereMirror.html
*Magnification (Magnifying Glass) http://microscopy.fsu.edu/primer/java/microscopy/simplemagnification/index.html * Lens Action (Many Applets) http://microscopy.fsu.edu/primer/lightandcolor/javalens.html http://www.techxhome.com/lightsite/optics/lenses/principleRays.html principle rays *Thick Lens (Spherical Aberration) http://www.cbu.edu/%7Ejvarrian/applets/lens3/thickl_z.htm