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Gullett-Phys-Unit2
Physics-Unit2-Light-Color
| Term | Definition |
|---|---|
| electromagnetic wave | An energy-carrying wave emitted by a vibrating charge (often electrons) that is composed of oscillating electric and magnetic fields that regenerate one another. |
| electromagnetic spectrum | The range of electromagnetic waves extending in frequency from radio waves to gamma rays. |
| transparent | the term applied to materials through which light can pass in straight lines |
| opaque | the term applied to materials that absorb light without reemissio nand thrus through which light cannot pass. |
| shadow | a shaded region that appears where light rays are blocked by an object. |
| umbra | the darker part of a shadow where all the light is blocked |
| penumbra | a partial shadow that appears where some but not all of the light is blocked |
| solar eclipse | an event wherein the Moon blocks light from the Sun and the Moon's shadow falls on part of the Earth |
| lundar eclipse | an event wherein the Moon passes into the shadow of the Earth |
| ultraviolet light | EM waves with a frequency just higher than visible light, causes cancer with prolonged exposure. |
| infrared light | EM waves with a frequency just lower than visible light, responsible for the "warmth" we feel from sunlight. |
| cornea | transparent cover over the eye |
| pupil | the opening created by the iris through which light enters the eye |
| iris | the colored part of the eye that increases or decreases the size of the pupil |
| retina | speciallized tissue made of rods and cones that covers the back of the eye |
| fovea | center region of the retina where vision is most distinct |
| blind spot | the location on the retina where the optic nerve exits toward the brain |
| optic nerve | located behind the retina, it transmits signals from the photoreceptor cells to the brain |
| additive primary colors | the three colors - red, blue, and green - that, when added in certain proportions, produce any other color in the visible light part of the EM spectrum and can be mixed equally to produce white light |
| complementary colors | any two colors that, when added, produce white light |
| subtractive primary colors | the three colors of absorbing pigments - magenta, yellow, and cyan - that, when mixed in certain proportions, reflect any other color in the visible light part of the EM spectrum. |
| pigments | fine particles that selectively absorb light of certain frequencies and selectively transmit others |
| radiation curve of sunlight | a graph of brightness versus frequency that shows sunlight is brightest in the yellow-green region, in the middle of the visible spectrum |
| atmosphereic ducting | the refraction (bending) of light as it passes through the Earth's atmosphere |
Created by:
lpgullett
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