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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 two nonparallel 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 light toward the base. |
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Biconvex |
An outward curved surface on both 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 two different powers. |
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Focal length |
The distance rays 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 |
The point on an ophthalmic presription 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 speed of light in air compared to the speed of light in a medium. |
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Sphere |
A lens having a single refractive power in all meridians. |
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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. |
