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Chapter 18 Light

♥Science, Mrs Hensley's , Block 1, Jessica B!!♥

TermDefinition
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