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26 Cards in this Set
- Front
- Back
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The direction in which light travels is known as a ______. |
The direction in which light travels is known as a ray. |
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A group of rays is called a _______. |
A group of rays is called a beam. |
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A ______ object is one that emits light. A source of light. |
A luminous object is one that emits light. A source of light. |
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An _______ object reflects light that comes from another source. (the moon) |
An illuminated object reflects light that comes from another source. (the moon) |
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A ______ object lets light pass through it. |
A translucent object lets light pass through it. |
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An ______ object blocks out all light. |
An opaque object blocks out all light. |
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The brightness of light is measured in ______. |
The brightness of light is measured in candlepower. |
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The amount of illumination is measured in _____. |
The amount of illumination is measured in foot-candles. |
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When a ray of light strikes a smooth surface, at least some light is ______. |
When a ray of light strikes a smooth surface, at least some light is reflected. |
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The ray that strikes the surface is called the _____. |
The ray that strikes the surface is called the incident ray. |
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After bouncing back from the surface, the ray is known as the ______. |
After bouncing back from the surface, the ray is known as the reflected ray. |
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A perpendicular line drawn to the surface at the ______ is called the ______. |
A perpendicular line drawn to the surface at the point of incidence is called the normal. |
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The angle between the incident ray and the normal is called the ______. |
The angle between the incident ray and the normal is called the angle of incidence. |
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The angle between the reflected ray and the normal is called the ______. |
The angle between the reflected ray and the normal is called the angle of reflection. |
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When light reflects off a rough surface, each ray is still bound by the ________. |
When light reflects off a rough surface, each ray is still bound by the law of reflection. |
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When the speed of light is greater in one medium than another, the first medium is said to have a ____________. |
When the speed of light is greater in one medium than another, the first medium is said to have a lower optical density. |
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All light rays passing through a lens must bend, except at one spot. This point is known as the _____ of the lens. |
All light rays passing through a lens must bend, except at one spot. This point is known as the optical center of the lens. |
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The center of the arc that makes up the side of the curved lens is called the _____. |
The center of the arc that makes up the side of the curved lens is called the center of curvature. |
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A line that passes through the optical center and the center of curvature is the _______. |
A line that passes through the optical center and the center of curvature is the principal axis of the lens. |
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Types of Lenses; Double Convex |
Round on both sides. |
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Types of lenses; Double Concave |
Inverted rounding on both sides. |
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Types of lenses; Plano Convex Lens |
Rounded on back side. |
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Types of lenses; Concavo Convex Lens |
Rounded on front side. |
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Types of lenses; Plano Concave |
Inverted rounding on front side. |
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Types of lenses; Step lens |
Step like ridging on back side. |
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Types of lenses; Fresnel lens |
Jagged inward stepping on back side. |
