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BJU PhysicalSci 15

BJU Physical Science - Ch 15

QuestionAnswer
One of the three distinct colors of light sensed by the human visual system (red, green, and blue) that, when mixed in various ratios, can produce all other colors of the visible spectrum. additive primary colors
The SI base unit of light intensity. candela
In-phase, monochromatic light waves from a single source. coherent light
Visible light produced by chemical reactions at temperatures far below those required for incandescence. cold light
All possible colors that can be produced by the combination of a specific set of primary colors. color system
A specularly reflective surface shaped like the interior of a greatly flattened bowl. The surface bulges away from the object being reflected. concave mirror
A specularly reflective surface shaped like a dome. The surface bulges toward the object being reflected. convex mirror
Technology using bundles of long, fine, transparent glass fibers that transmit light along their lengths by total internal reflection. fiber optics
The emission of visible light by a substance that is exposed to high-frequency electromagnetic energy. fluorescence
The distance from the center of a lens or mirror to its principal focus. focal length
The point at which nonparallel incident light rays are focused by a concave mirror or converging lens. It varies depending on the degree of divergence of the incident light rays. focal point
Light produced by materials that are heated until they glow. incandescence
A light ray approaching a reflective surface or a boundary between different refractive media. incident ray
The ratio of the speed of light in a vacuum to the speed of light in a given medium; a measure of a medium’s optical density. index of refraction
A mathematical relationship in which the magnitude of one quantity varies with the inverse of the square of another. inverse-square law
Law stating that the angle of an incident ray equals the angle of the reflected ray. Both angles are measured in relation to the normal at the point of incidence. law of reflection
A disk of transparent material that refracts light so that the light converges or diverges. lens
The angular separation of the various frequencies in a beam of light by refraction, as with a prism. The dispersion angle is greater for higher frequencies. dispersion
A reflective surface having no curvature; a flat mirror. plane mirror
A representation of the path a light photon takes. ray
An image formed when light rays from a point on an object converge after reflecting off a mirror or passing through a lens. It exists apart from any visual system perceiving it. It is upside down and reversed and can be projected on a screen. real image
A light ray moving away from the point of reflection. reflected ray
One of several distinct colors of pigment (e.g., cyan, magenta, yellow) that, when combined in various ratios, produce all colors in the associated color system by the absorption of incident or transmitted light. subtractive primary color
Reflection of a light ray approaching the boundary between two media from within the optically denser medium. It occurs when the incident angle exceeds the critical angle for the two media. total internal reflection
An optical illusion perceived by the visual system when processing diverging light rays reflecting off a mirror or passing through a lens. It is upright and cannot be projected on a screen. virtual image
The continuing emission of visible light after a substance has been exposed to high-frequency electromagnetic energy. phosphorescence
The change of direction of a wave or moving particle at the boundary between 2 media as it returns to the original medium Reflection
Created by: marchscience
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