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Light Waves

Vocabulary words for Middle school students dealing with light, the electromagnetic spectrum, and reflection/refraction of light waves.

luxa unit of measure for the brightness of light
reflectionthe bouncing back of a wave after it hits a barrier
diffuse reflectionthe scattering of light waves after they hit an irregular barriar
refractionthe change in direction when a wave enters a different medium
convex lensa lens that is thicker in the middle then it is at the edges; causes light rays to converge
concave lensa lens that is thinner in the middle than it is at the edges; causes light rays to diverge
focal lengththe distance from the lens to the focus
retinaa sensitive layer of nerve cells at the back of you eye
farsightednesswhen the eyeballs are a little too short from front to back
nearsightednesswhen the eyevalls are too long from front to back, images are formed in front of the retina
electromagnetic wavestransverse waves that carry both electric and magnetic energy (light waves)
electromagnetic spectrumthe arrangement of EM waves in order of wavelength and frequency
visible spectrumRed, Orange, Yellow, Green, Blue
x-rayshigh frequency EM waves, rays can penetrate thorugh skin, but not dense material like bones.
ultraviolet radiationEM waves with a frequency just higher than visible light
infrared radiationpart of the EM spectrum were light waves are just below visible light
radio wavesEM waves with the lowest frequency, longets wavelengths
phosphor dotsdots on a TV screen, that re simulated, resulting in color.
radarradio detection and ranging
microwavesshort wavelength radio wavbes used for cooking and communication
rodslight sensitive cells found in the retina of the eye, allow you to see in dim light
conescells in the retina that allow you to detect color and contorls the sharpness of an image
primary colors of lightRed, Green, and Blue
secondary colors of lightCyan, Yellow, and Magenta
polarized lightlight passed through a polarizing filter
Jan Vermeerartist, accused of using the "camera obscura" to trace his paintings
Oleaus Roemercalculated the speed of light by studying the eclipses of Jupiter's moons
300,000 km/secspeed of light in a vacuum
colorblindenessthe inability to distinguish colors, usually red and green

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