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PS - Light (Ch. 18)

Light - Ch. 18 - Prentice Hall PS - Science Explorer

TermDefinition
transparent material a material that transmits light without scattering
translucent material a material that scatters light as it passes through
opaque material a material that reflects or absorbs all of the light that strikes it
primary color three colors that can be used to make any other colors
secondary color any color produced by combining equal amounts of any two primary colors
complementary color any two colors that combine to form white light or black pigment
pigment a colored substance used to color other materials
ray a straight line used to represent a light wave
regular reflection reflection that occurs when parallel rays of light hit a smooth surface and all reflect at the same angle
diffuse reflection reflection that occurs when parallel rays of light hit a rough surface and reflect at all different angles
plane mirror a flat mirror that produces an upright, virtual image the same size as an object
image a copy of an object formed by reflected or refracted rays of light
virtual image an upright image formed where rays of light appear to meet or come from
concave mirror a mirror with a surface that curves inward
optical axis an imaginary line that divides a mirror in half
focal point the point at which light rays parallel to the optical axis meet, or appear to meet, after being reflected (or refracted) by a mirror (or lens)
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 a ray of light bends when it passes from one medium to another
mirage an image of a distant object caused by refraction of light as it travels through air of varying temperature
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 at 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 the opening in the center of the iris through which light enters the inside of the eye
iris the ring of muscle that controls the size of the pupil and gives the eye its color
retina the layer of cells that lines the inside of the eyeball
rods cells in the retina that detect dim light
cones cells in the retina that respond to and detect color
optic nerve short, thick nerve that carries signals from the eye to the brain
nearsighted a condition that causes a person to see distant objects as blurry
farsighted a condition that causes a person to see nearby objects as blurry
telescope an optical instrument that forms enlarged images of distant objects
refracting telescope a telescope that uses two convex lenses to form images
objective a lens that gathers light from an object and forms a real image
eyepiece a lens that magnifies the image formed by the objective
reflecting telescope a telescope that uses a concave mirror to gather light from distant objects
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 an image of an object
laser a device that produces a narrow beam of coherent light
hologram a three-dimensional photograph created using lasers
optical fiber a long, thin strand of glass or plastic that can carry light for long distances without allowing the light to escape
total internal reflection the complete reflection of light by the inside surface of a medium
Created by: mwhite5