Chapter 23: Light. Vocab
Terms
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- Complementary Color
- One of two colors that combine to form white light
- Cone
- Nerve cell in the retina of the eye that is sensitive to a primary color.
- Diffuse Reflection
- Reflected light that is scattered in many different directions due to an irregular surface: produces a "fuzzy"
- Electromagnetic Spectrum
- Arrangement of electromagnetic waves in order of their wavelength and thus their frequency
- Electromagnetic Waves
- Wave that is both electric and magnetic in nature, light wave.
- Farsightedness
- Condition in which a person had difficilty seeing nearby objects.
- Gamma Ray
- Highest Frequency electromagnetic wave.
- Index of Refraction
- Measure of the amount by which a material refracts light
- Infrared Ray
- Electromagnetic wave with a frequency slightly lower than visible red light.
- Invisible Spectrum
- Waves with frequency less than 430 trillion hertz or greater than 760 trillion hertz that are thus invisible to the human eye.
- Iris
- Colored area surrounding the pupil of the eye that controls the amount of light that enters the pupil.
- Microwave
- Radio wave with a frequency between 1 billion hertz and 1 trillion hertz
- Modulation
- Variation in either amplitude or frequency of a wave.
- Nearsightedness
- Condition in which a person has difficulty seeing objects at a distance.
- Opaque
- Unable to transmit light.
- Photoelectric Effect
- The production of electrons by photons of light
- Photon
- The tiny particle that contains the exact amount of energy absorbed by the electron
- Polarized Light
- Light whose waves vibrate along a single plane.
- Primary Color
- One of three colors that can be mixed to produce light of any color: red, blue or green.
- Primary Pigment
- Yellow, Sigan, Magenta
- Pupil
- an opening that allows light to enter the eye
- Radar
- Radio detecting and ranging: short: wavelength microwaves used in locationg objects, calculating distnace to objects, and monitoring speed.
- Radio Wave
- Electromagnetic wave with a frequency between 10,000 hertz and 1 trillion-hertz.
- Regular Reflection
- Relfected light in which the rays are reflected parallel to each other with very little scattering; produces a clearly defined image
- Retina
- Part of the eye on which light converges to form an image
- Rod
- Nerve cell in the retina of the eye that is sensitive to light and dark
- Translucent
- Able to tramsmit light but no detail of that light
- Transparent
- Able to transmit light readily
- Ultraviolet Ray
- Electromagnetic wave with a frequency just higher than visible violet light
- Visible Spectrum
- Portion of the electromagnetic spectrum to which human eyes are sensitive; light waves with frequencies between 430 trillion hertz and 760 trillion hertz.
- X-ray
- Electromagnetic wave with a frequency just above ultraviolet