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Unit 10 |
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Electromagnetic Spectrum |
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Particle theory vs. Wave theory |
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Observations of light |
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1. Rectilinear propagation (straight line
motion)
Diffraction - bending of light
around an object explained as waves being very close together |
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2. Reflection |
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3. Refraction |
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Propagation of light |
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Electromagnetic theory |
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3-D (electric field + magnetic field >>EM
waves) |
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Mirrors |
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plane (flat) |
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converging |
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diverging |
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Ray Tracing |
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real image |
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virtual image |
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Index of refraction (n) |
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apparent depth |
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Photoelectric effect |
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an incident beam of light may cause electrons to
jump |
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from one metallic surface to another |
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Quantum theory |
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light is radiant energy transported in photons
carried along by a wave field |
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photons are "packets of energy"
released as electrons |
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give off the energy they have gained from an
outside source |
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energy is directly related to frequency |
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Color |
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primary colors of light (red, blue, green) |
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primary colors of pigment (red, blue, yellow) |
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additive color vs. subtractive color |
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Vision |
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rods |
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cover the entire retina |
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black and white |
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cones |
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concentrated in fovea |
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red, blue and green |
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Myopia (nearsighted) |
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Hyperopia (farsighted) |
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Astigmatism |
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an irregular curvature of the lens |
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Broad range of frequencies and wavelengths |
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All have the same speed = 300,000,000 m/s |
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The energy of a single photon of light, the
energy released as one electron moves from a higher energy level to a lower
energy level |
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Microwave diathermy |
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Infrared heat |
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UV sterilization |
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X-rays |
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radiation therapy |
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Notes