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31 Cards in this Set
- Front
- Back
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electromagnetic spectrum
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range of electromagnetic radiation
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ray model of light
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symbolizes light rays as geometric rays
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images
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occur when light rays have changede direction while traeling to us, causing us to see things that aren't really there
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real images
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light rays that make up the image CONVERGE
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virtual images
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light rays that make up the image DIVERGE
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reflection
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when light (or any wave) bounces off of the boundary of a new material
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specular reflection
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when light bounces off a smooth surface, so that all of the incoming light at a certain angle bounces off at the same angle
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diffuse reflection
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occures when light bounces off of a rough or textured surface, so that incoming light at a certaiun angle bounces off at many different outgoing angles and is scattered
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angle of incidence
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angle made by light ray and normal of surface
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angle of reflection
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angle outgoing light makes with normal of surface
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plane mirror
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mirror with flat surface
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spherical mirror
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mirror shaped like part of a sphere
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center of curvature
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pont where center of sphere would be if mirror were a complete sphere
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radius of curvature
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radius the mirror would have if it were a complete mirror
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focal point
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point at whihc incoming parallel light rays converge or the point from which they diverge
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focal length
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distance from the mirror to the focal point
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spherical aberration
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b/c not all light rays converge at a single point for spherical mirrors, it creates a blurred image
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principle rays
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three particular light rays that are easy to identify and draw on diagrams
1) in parallel, out thru focal point 2) in thru focal point, out parallel 3) in and out thru center |
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concave mirrors
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light hits the inside of the sphere (into the cave)
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convex mirrors
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light hits the outside of a sphere
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refraction
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light (or any wave) is transmitted into a new material
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index of refraction
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ratio of the speed of light in a vacuum to the speed of light in that material
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critical angle
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angle of incidence less than 90 degrees which produces a refracted angle of 90 degrees
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total internal reflection
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for angles of incidence greater than critical angle, the reflected wave is sent back into original material
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converging lenses
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lenses that make light rays converge
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divergine lenses
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make light rays diverge
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dispersion
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spreading out of light into component wavelengths
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polorization
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a process off blocking out all light rays except those with an electric field aligned in a particular way
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scattering
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when light is absorbed and re radiated by particles
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additive color wheel
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light rays combine to make white
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subtractive color wheel
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pigments (like paint) combine to create black
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