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Light & Optical syst
Grade 8 Science
| Question | Answer |
|---|---|
| light | The form of energy we can see. |
| radiant energy | Energy transfered or transmitted as waves or rays in all directions |
| artificial light source | A human made source of light |
| Incandescence | The emission of visible light by a hot object |
| fluorescence | The process in which high energy, invisible ultravioletlight is absorbed by the particles of an object, which then emits some of this energy as visible light, causing the object to glow |
| phosphorescence | The persiistent emission of light following exposure to and removal of a source of radiation |
| chemiluminescence | The emission of light resulting from chemical action and not involving heat |
| bioluminescence | The emission of light produced by chemical reactions inside it's body to produce light |
| luminous | Giving off its own light |
| transparent | Allowing light to pass through |
| translucent | Allowing some light to pass through. The light, however, is scattered from it's straight path |
| opaque | Not allowing any light to pass through |
| Reflection | The casting back of light from a surface |
| Angle of incident | In optics, the angle between the incident ray and the normal |
| plane mirror | A mirror having a flat surface |
| Law of reflection | The two main predictible behaviours of reflected light: 1. The angle of incidence is equal to the angle of reflection. 2. The incident ray, the normal, and the reflected ray are always in the same plane. |
| Convex mirrors | Mirrors that buldge out |
| Concave mirrors | Mirrors that are caved in |
| Virtual image | An image located where reflected rays only seem to originate |
| Refraction | The bending of light when it travels form one medium to another |
| Angle of refraction | In optics, the angle between the normal and the reflected ray |
| Lens | A curved piece of transparent material, usually glass or plastic. Light rays bend as they pass through a lens. |
| Double convex lens | Double convex is thicker in the middle than around the edges. This causes the refracting light rays to come together ,or converge. |
| Double concave lens | Is thinner and flatter in the middle then around the edges. Light passing through the thicker, more curved areasof lens will bend more then light passing through flatter edges. |
| Retina | A light sensitive area at the back of your eye |
| Near- Sighted | People who have trouble seeing distant objects |
| Far- Sighted | Have trouble seeing objects that areclose to them |
| Diaphram | Is a device that controls the opening of the lens or optical system. |
| Aperature | The opening of a lens or optical system. |
| Shutter | In a camera,a device that opens the aperature to allow light to reach the film; can let more light reach the film by staying open longer |
| Optic Nerve | The nerve that conects the eye to the brain |
| Blind Spot | The point where the optic nerve enters the retina; has no light-sensing cells |
| Prisms | In binoculars, glass blocks serving as plane mirrors; allow binoculars to be made shorter than telescopes |
| Soaler spectrum | The patterns of colors in sunlight: red, orange, yellow, green, blue, indigo, and violet |
| Rod cell | In the retina of the eye, a cylinder-like cell that detects the presence of light |
| Cone cell | In the retina of the eye, a cone-shaped cell that detects color |
| Color Blindness | A condition in which people have difficulty distinguidhing between some colors |
| Crests | The high part of a wave |
| troughs | The low part of a wave, between crests |
| wavelength | The distance from crest to crest, or from trough to trough, of a wave of light as it travels through space; also used to describe the distance from crest to crest, or from trough to trough, of a water wave |
| amplitude | In a wave the height of the crest or the depth of the trough |
| frequency | The number of entire cycles completed by a vibrating object in a unit of time; usually given in cycles per second, or hertz |
| Laserlight | A device for amplifying light to produce an intense, narrow, beam; used in computer printers, surgical procedures, and other applications. The term stand s for light amplication by the stimulated emmision of radiation |
| Incoherent light | Refering to light, having many different wavelength but the waves are not lined uP |
| Coherent light | Refering to light, having only one wavelength, with all waves lined up in a similar pattern |
| Electromagnetic spectrum | The arrangement by wavelength of the different forms of electtro magnetic radiation, including visible light energy |
| Ultraviolet Light | Radiation lying in the ultraviolet range, wavelengths shorter then light but longer than xrays |
| Xrays | Electromagnetic radiation having a very short wavelength; can penetrate substances such as skin and muscle |
| Gamma Rays | The rays having the shortest frequency and highest energy of all radiant waves in the electromagnetic spectrum; Gamma rays come from nuclear reactions |
| Angle of reflection | In optics, the angle between the normal and the reflected ray |
Created by:
nawolskim
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