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Chapter 18 Light
♥Science, Mrs Hensley's , Block 1, Jessica B!!♥
| Term | Definition |
|---|---|
| Transparent Material | A material that transmits most of the light that strikes it |
| Translucent Material | A material that scatters light as it passes through |
| Opaque Material | Reflects or absorb all of the light that strikes it |
| Primary Color | Three colors that can combine to make any other color |
| Secondary Color | Two primary colors that combine in equal amounts |
| Complementary Color | Any two colors that combine to form white light |
| Pigment | Colored substances that are used to color other materials |
| Ray | A straight that that is used to represent a light wave |
| Regular Reflection | When parallel rays of light hit a smooth surface |
| Diffuse Reflection | When parallel rays of light hit a bumpy or uneven surface |
| Plane Mirror | A flat sheet of glass that has a smooth, silver-colored coating on one side |
| Image | A copy of an object formed by reflected or refracted rays of light |
| Virtual Image | An upright image that formed where rays of light appear to meet or come from |
| Concave Mirror | A mirror with a surface that curves inward like the inside of a bowl |
| Optical Axis | An imaginary line that divides a mirror in half |
| Focal Point | The point at which rays parallel to the optical axis meet, or appear to meet, after being reflected |
| Real Image | An upside-down image formed where rays of light meet |
| Convex Mirror | A mirror with a surface that curves outward |
| Index of Refraction | A measure of the amount of ray of light bends when it passes from one medium to another |
| Mirage | An image of a distant object caused by refraction of light |
| Lens | A curved piece of glass or other transparent material that is used to refract light. |
| Convex Lens | A lens that is thicker in the center than the edges |
| Concave Lens | A lens that is thinner in the center than at the edges |
| Cornea | The transparent front surface of the eye |
| Pupil | An opening through which light enters the inside of the eye |
| Iris | An opening through which light enters the inside of the eye |
| Retina | A layer of cells that lines the inside of the eyeball |
| Rods | Cells in the eye that allow you to see in dim light |
| Cones | Cells that respond to color |
| Optic Nerve | Short, thick cord that send optical information to the brain |
| Nearsighted | When someone can see nearby things clearly, but have trouble seeing far away |
| Farsighted | When someone can see far away things clearly, but has trouble seeing up close |
| Refracting Telescope | Telescope that contains two convex lenses |
| Objective | Convex lense that gathers light coming from an object and focuses it |
| Eyepiece | The lens that magnifies the image that the objective forms. |
| Reflecting Telescope | A telescope that uses a large concave mirror to gather light. |
| Microscope | An optical instrument that forms enlarged images of tiny objects. |
| Camera | An optical instrument that uses lenses to focus light, and film to record of an object. |
| Laser | A device that produces a narrow beam of coherent light. |
| Hologram | A 3-D photo created by using laser light. |
| Hologram | Long, thin strands of glass or plastic that can carry light for long distances without allowing the light to escape. |
| Total Internal Reflection | Long, thin strands of glass or plastic that can carry light for long distances without allowing the light to escape. |
Created by:
PrimadonnaGirl
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