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49 Cards in this Set
- Front
- Back
The material a wave travel through |
a medium |
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Can travel without a medium; can travel through an empty space |
light |
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You need ______ to make a wave |
energy |
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Repeated back-and-forth or up-and-down motion caused by energy to the medium |
Vibration |
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4 basic properties of waves |
amplitude, wavelength, frequency, speed |
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Maximum distance between the resting position and crest (top of the wave) |
Crest |
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Number of complete waves that pass in a certain time |
Frequency |
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The unit of the frequency of a wave is measured |
hertz |
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------ transfers electrical and magnetic energy that vibrate at right angles |
An electronicmagnetic wave |
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The energy that is transferred through space by electromagnetic waves |
electromagnetic radiation |
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The electromagnetic spectrum is made up of... |
radio waves, infrared waves, visible light, ultraviolet rays, X rays and gamma rays |
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Electromagnetic waves that you can see |
visible light |
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How does visible light interact with an object? |
The light can be reflected, transmitted or absorbed
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A _______ material transmits most of the light that strikes it |
transparent |
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A _______ material scatters light as it passes through. you can see the object but blurred |
translucent |
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An _______ material reflects or absorb all of the lights that strikes it. You can't see through. |
opaque |
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3 colors that can combine to make any other color |
primary colors (red,green and blue) |
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2 primary colors combined in equal amounts to produce a _______ color |
secondary |
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Any 2 colors that combine to form white light |
complementary colors |
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the law of reflection |
states that the angle of incidence equals the angle of reflection |
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How is mixing pigments different from mixing colors of light? |
The ore pigments are added together, fewer colors of lights are reflected and more are absorbed |
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a flat sheet of glass that has a smooth, silver-colored coating on one side. |
a plane mirror |
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A mirror with a surface that curves inward like the inside of a bowl |
a concave mirror |
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An imaginary line that divides a mirror in half |
optical axis |
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The point at which rays parallel to the optical axis meet or converge |
focal point |
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A mirror with a surface that curves outward |
a convex mirror |
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When light rays enter a medium at an angle, the change in speed cassette rays to bend, or change direction |
Refraction |
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A curved piece of glass or other transparent material that refracts light |
a lens |
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A lens that is thicker in the center than at the edges (= magnifying glass) |
a convex lens |
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A lens that is thinner in the center than at the edges |
a concave lens |
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Which type of lens can only produce virtual images because the parallel light rays passing through the lens never meet? |
Concave lens |
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What causes light rays to bend when they enter a new medium at an angle? |
change of speed |
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How do you see objects? |
The light from an object enters the eye, your eye sends the single to your brain and you see the object |
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The transparent front surface of the eye. It protects the eye and acts as a lens to help focus light rays |
cornea |
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An opening through which light enters the inside of the eye |
pupil |
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A ring of muscle that contracts and expands to change the size of the pupil |
Iris |
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A layer of cells that lines the inside of the eyeball |
Retina |
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Tiny light sensitive cells in the retina that responds to light and color |
Rods and Cones |
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Where does the image form in the eye |
Retina |
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______ lenses are used to correct nearsightedness |
concave |
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______ lenses are used to correct farsightedness |
convex |
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A _____ person can see nearby things more clearly but object far are blurred |
nearsighted |
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A _____ person can see the things far clearly but objects near are blurred |
farsighted |
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How is an image formed on the retina? |
The light enters the pupil and the lens. The lens bends light to form an upside down image on the retina. |
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What part of a camera controls the amount of light that enters the camera? |
"Lens" focus the light to form the image |
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The larger lens that gathers the light coming fro an object and focuses the rays to form a real image in a refracting telescope |
the objective lens |
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A reflecting telescope uses a _____ mirror to gather light |
concave |
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What is the difference between refracting telescope and a reflecting telescope? |
Refracting Telescopes use a large objective lens as their primary light-collecting element. Reflecting Telescopes use a concave primary mirror to collect light and form an image. |
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The color of an opaque object is the color of the _____ it reflects |
light |