Mr. Jackson 5-3-12
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Light is an EM wave (not requiring a medium)
EM waves are produced by radiation which is
the transfer of energy in the form of a wave
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The Speed of Sound was 343m/sec
The speed of light is 300,000,000m/sec
This is 880,000 times faster than the speed
of sound
If you could run at the speed of light you
could circumnavigate the earth 7.5 times per
second
It takes 8.3 min for the sun to transmit light
to the earth
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The entire range of EM waves is called the EM
spectrum
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Longest Wavelength (over 30 cm)
FM and AM radio and analog television
signals are broadcast using Radio waves
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Wavelength between 1mm and 30 cm
Microwave ovens, Cell Phones and Radar(
Used to detect speed of a car) use
microwaves.
Used to detect heat
 Military and Fire
 Kitchens to keep food
Hot
 IR thermometer
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The only part of the EM Spectrum you can
see.
The colors are Red, Orange, Yellow, Green,
Blue, Indigo, Violet
Roy G. Biv
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More violet than violet (Ultra Purple)
Commonly known as UV
Tanning beds, black light, ect.
UV CAUSES CANCER!!!
UV Causes sunburn
UV does allow the body to utilize vitamin D
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Will pass through many materials
Used in medical diagnostics
Used for security devices in airports ect.
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Have the shortest wavelength
Penetrate most materials easily
Used for radiation treatment for cancer
Also used to kill harmful bacteria in food
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Light waves can be reflected by using a
mirror
The law of reflection states that the angle of
incidence is equal to the angle of reflection
Incidence is the arrival of a beam of light at a
surface
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Objects that produce visible light are called
luminous
Objects that are visible but do not produce
light are called illuminated
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When light becomes dimmer while traveling
through a medium such as air is Absorption
Scattering is where light becomes dimmer
due to the particles of light spreading out
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Refraction of light is the bending of light
This process occurs because light travels
slower through solids and liquids than it does
air
Refraction will separate visible light into the 7
primary colors by using a prism
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A Transparent object allows light to be
transmitted through the object (Glass)
A Translucent object transmits light but not
an image ( Wax Paper)
An opaque object will not transmit light or an
image
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Red, Blue and Green are the Primary colors of
light.
When the colors of light combine they undergo
color addition which produce the secondary
colors of light which are Magenta, Cyan, and
Yellow
Television screens produce the colors Red, Blue
and Green. New Televisions with 3-D
Technology and LED Technology use Yellow in
the pixels to produce more vibrant color schemes
When all the Primary colors mix they produce
White light
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The primary pigments are Yellow, Magenta,
and Cyan and by the process of color
subtraction they produce the Primary Colors
of light
When they all mix together they produce
Black
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A plane mirror has a flat surface. Images
appear the same size but are reversed right
to left
Concave Mirror makes objects appear smaller
shaped like the inside of a spoon
Convex Mirror Makes objects appear larger
shaped like the back of a spoon
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A lens is a transparent object that refracts
light
Convex Lenses is thick in the middle and
narrow on the edge. Used in magnifying
lenses and in cameras
Concave Lenses are thin in the middle and
thick on the edges. Used in eyeglasses and
microscopes
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Nearsightedness is a condition where they
eye is too long. These people see things up
close but not far away
Farsightedness is there the eye is too short.
These people can see far away but not up
close
Color Blindness where the cones that receive
color do not function properly
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Lasik is a surgical procedure where laser is
used to reshape the lens of the eye. It is
minimally invasive although the cornea is cut.
PRK is a surgical procedure that is used to
reshape the lens. In this procedure the
cornea is burned away by a laser and the
recovery is longer however the correction
tends to last longer
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Produces intense light of only 1 wavelength
and color. The waves in a laser behave as 1
wave
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Thin glass tubes that transmit light.
Used for data and voice communication also
used for video
Light in a pipe
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Polarized light is light that has passed
through a filter and only 1 plane of the light
is allowed to pass.