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Geometric Optics

Heavy Light Folks, Definitions, Critical Angle, Lateral Shift, Apparent Depth

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