Term
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Definition
lets NO light through
absorbs most or all of the light
cannot see other objects through it
ex. wood of a door
brick wall |
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Term
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Definition
nearly ALL the light passes through
you CLEARLY can see the objects on the other side
ex. glass
clear plastic |
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Term
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Definition
SOME light is absorbed
SOME light passes through
objects on other side are visible...but not clear
ex. wax paper
frosted glass |
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Term
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Definition
reflect light ways in a regular way (not scattered)
ex. parallel rays reflect parallel to the mirror |
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Term
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Definition
| rough surface causes light rays to be reflected in many directions |
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Term
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Definition
bending of light waves due to a change in speed
light wave travels from one medium (like air) to another (like water)...due to the different densities of the mediums...the speed of the light wave changes and bends
the greater the speed the more the light wave bends |
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Term
colors of light
and
wavelength |
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Definition
white light is a mixture of colors
each color of light is a light wave with different wavelength
Red = longest wavelength
Violet = shortest wavelength |
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Term
Primary Light Colors
Rays of Light |
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Definition
Primary Light Colors = Red, Green, Blue
mixing:
Red + Green = Yellow
Green + Blue = Cyan
Blue + Red = Magenta
Red + Green + Blue = WHITE
all the colors together make WHITE light |
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Term
Primary Pigment Colors
materials like paint |
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Definition
Primary Pigment Colors = Yellow, Cyan, Magenta
mixing:
Yellow + Cyan = Green
Cyan + Magenta = Purple
Magenta + Yellow = Red
Yellow + Cyan + Magenta = BLACK
all the colors together make BLACK light |
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Term
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Definition
to take in
to soak up (like a sponge) |
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Term
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Definition
bounces off a surface
not absorbed |
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Term
Primary Light Colors
overlapping circles |
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Definition
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Term
Primary Pigment Colors
overlapping circles |
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Definition
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Term
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Definition
surface curved inward...like a bowl or spoon
cause light rays to come together, "cave"-in, converge
light rays travel parallel to optical axis
hit the mirror
reflect off - pass through FOCAL Point on the optical axis
Image: can be upright OR inverted
can be smaller OR larger than object |
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Term
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Definition
surface curves outward...like back of a spoon
cause light waves to spread out/apart, diverge
Image: is always upright and smaller than the object |
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Term
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Definition
| do NOT need a medium to travel |
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Term
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Definition
a straight line drawn normal
to the center
of a convex mirror |
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Term
speed of light is
300,000 km/s
question: if light travels at 300,000 km/s and Earth is 150 million km from the Sun, how long does it take light to travel from the Sun to the Earth? |
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Definition
Time = distance / speed
Time = 150,000,000 km
300,000 km/s
=150,000,000 km * 1 second
1 300,000 km
=500 seconds
= 8.3 minutes |
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Term
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Definition
uses convex lenses
forms an enlarged image on the objective lense
the image then enlarges again on the eyepiece lense (Ocular lense)
can magnify objects as large as 2,500 times |
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Term
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Definition
uses large concave mirror or gather image
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