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Geometric Optics
Heavy Light Folks, Definitions, Critical Angle, Lateral Shift, Apparent Depth
| Question | Answer |
|---|---|
| 1600's - Huygens | Wave Theory - waves in ether |
| 1600's - Newton | Corpuscular Theory - light travels as a stream of particles |
| 1670 - Ola of Romer | Danish astronomer that timed the eclipse of Jupiter's moons |
| 1800's - Maxwell | Electromagnetic Theory of Light - improved with math |
| 1800's - Hertz | produced electromagnetic waves in a lab proving Maxwell |
| 1849 - Fizeau | used a toothed cogwheel and a mirror to measure speed of light; 187,000 mi/sec |
| 1900 - Plank | Photon Theory (Quantum Theory) - divided light into small portions called quanta. |
| 1905 - Einstein | used quantum theory to explain the photo-electric effect |
| 1923 - Michaelson | used an octagonal moving mirror experiment to show light travels 186,285 mi/sec in air and 186, 720 mi/sec in a vacuum |
| Source | generates light |
| Point source | infinitely small source of light |
| Extended source | more than one point of light |
| monochromatic source | A source that produces just one wavelength (color) |
| polychromatic source | A source that produces multiple wavelengths (colors) |
| geometric optics | Light traveling in straight lines |
| physical optics | light traveling in waves, also describes "diffraction" |
| Diffraction | light bending around corners |
| wavelengths for visible light | 380-760 nm (400-800) |
| wavelengths used to calculate index of refractions | 587.56 nm (yellow) |
| What are the three factors that influence shift? | Index of Refraction; Angle of Incidence; Thickness of the Medium |
| When any of the influences are increased, the shift will become ________? | Greater |
| What is critical angle? | The angle of incidence when angle r = 90 degrees. |
| When can you exceed the critical angle? | When going from a higher index of refraction into a lower index of refraction medium. |
| If angle i is less than the critical angle the ray is....? | Refracted into the second medium |
| If angle i is more than the critical angle the ray is...? | Reflected back into the first medium....known as total internal reflection |
| How do you find the critical angle? | Use Snell's Law and let angle r = 90 degrees |
| Memorize formulas for Lateral Shift, Apparent Depth when viewing along the normal, and Apparent Depth when viewing from an angle! |
Created by:
griffiskr
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