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Ch18 Light


Transparent Material light passes through without being scattered
Translucent Material scatters light as it passes through
Opaque Material reflects or absorbs light as it passes through it
Primary Color three colors that combine to make a color
Secondary Color two primary colors that combine in equal amounts to make a secondary color
Complementary Color any two colors that can combine to make white light
Pigment colored substances that are used to color other materials
Ray a straight line used to represent a light wave
Regular Reflection when all light ray are reflected at the same angle because of the smooth surface
Diffuse Reflection A reflection that occurs when rays of light that are parallel hit a rough surface and go into different directions.
Plane Mirror A flat mirror which produces a virtual
Image A copy of an object which is formed by reflected/refracted light rays.
Virtual Image Upright image formed where light rays meet or come from.
Concave Mirror An inward curving mirror.
Optical Axis Imaginary line dividing a mirror in half.
Focal Point The point where rays of light parallel to the optical axis meet after being reflected.
Real Image Upside down image formed where light rays meet.
Convex Mirror A mirror with an outward curving surface.
Index of Refraction A measure of how much a ray of light bends when it enters a certain material.
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 it is at the edges.
Concave Lens A lens that is thicker at the edges than in the center.
Cornea A section of the eye that protects it and helps focus light rays.
Pupil An opening through which light enters the inside of the eye.
Iris A ring of muscle that contracts and expands to change the size of the pupil and gives the eye color.
Retina A layer of cells that lines the inside of thr eyeball.
Rods Cells that contain a pigment that responds to small amounts of light.
Cones Cells that respond to color.
Optic Nerve A short
Nearsighted A description of a person who can see nearby object but distant objects appear blurred because the eyeball is too long.
Farsighted A description of a person that can see objects that can see distant objects but nearby objects are blurry because the eyeball is too short.
Telescope An optical instrument that forms pictures of enlarged objects that are distant.
Refracting Telescope A telescope that has two convex lenses
Objective The piece of a telescope that gathers light from an object that comes from an object and focuses the rays to form an image.
Eyepiece The lense close to you eye
Reflecting Telescope uses large concave mirror to gather light
Microscope an optical instrument that forms enlarged images of tiny objects
Camera uses one or more lenses to focus light
Laser a device that produces a narrow beam of coherent light
Hologram a three-dimensional photograph created by using light from a laser
Optical Fiber long
Created by: redzone31