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20 Cards in this Set
- Front
- Back
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Refraction |
The bending of light |
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Apex |
The thinnest point at which the non parallel surfaces of a prism meet |
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Base |
The widest portion of a prism, opposite of the apex |
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Corpuscular theory |
Light traveling in minute bursts of energy particles called photons |
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Prism |
Triangular shaped piece of glass or plastic which deviates the light towards the base |
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Bi convex |
An outward curved surface on both the front and back sides |
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Chromatic aberration |
When white light is broken into its spectral component colors |
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Astigmatism |
When light has more than one focal point and must be corrected by a lens having 2 different powers |
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Focal length |
The distance Ray's of light converge after passing through an optical lens |
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Wave theory |
Light traveling in waves |
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Wave length |
The distance from the Crest of one wave to the Crest of the next |
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Emergent ray |
Light that exits the lens |
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Optical center |
That point on an ophthalmic prescription lens through which no prismatic effect is manifested |
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Incident ray |
Light that enters the lens |
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Normal |
An imaginary line which represents optical center on a lens |
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Reflection |
The bouncing off of light by a lens surface |
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Refractive index |
The ratio of the speed of light in air compared the the speed of light in a medium |
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Sphere |
A lens having a single refractive power in all mediums |
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Spherocylinder |
The combination of sphere and cylinder powers into a single lens |
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Toric |
A surface having two separate curves at right angles to one another |
