18.4 color this student is looking at many colors on his computer screen. what he is actually...
TRANSCRIPT
18.4 Color
This student is looking at many colors on his computer screen. What he is actually seeing, however, are combinations of only three colors of light.
18.4 Color
How does a prism separate white light?
Key Concepts
What determines the color of an object?
What are the primary colors of light?
What are the primary colors of pigments?
18.4 Color
Key Concepts
As white light passes through a prism, shorter wavelengths refract __________ than longer wavelengths, and the colors separate.
After passing the prism, which color of visible light bends the most?
more
violet
18.4 Color
Sunlight is made up of ______ the colors of the visible spectrum.
The process in which white light separates into colors is called _________________.
A rainbow forms when droplets of __________ in the air act like prisms.
Separating White Light Into Colors all
dispersion
water
18.4 Color
• When light __________ a raindrop, it slows down and refracts.
• Then it reflects off the far inner ______________ of the raindrop.
• It refracts again as it __________ the raindrop, speeds up, and travels back toward the source of the light.
Separating White Light Into Colors enters
surface
leaves
18.4 Color
The Colors of Objects
The color of any object depends on…• what the object is ____________ of• on the color of __________ that strikes the
object.
made
light
and how yourown eyeswork!
18.4 Color
An object’s color is the color of light that reaches your _________ when you look at the object.
• Sunlight contains all the colors of the visible spectrum.
• A red car in sunlight ____________
mostly ________ light.
• Most of the rest of the light is ________________ at the surface of the paint.
The Colors of Objects
eyes
reflectsred
absorbed
18.4 Color
What happens if you change the color of the light shining on an object?
Only the colors that are ________________ can be reflected.
The Colors of Objects
in the light
18.4 Color
What are the primary colors of light?
Primary colors are three specific colors that can be _________________ in varying amounts to create all possible colors.
Mixing Colors of Light
The primary colors of light are _________, ___________, and ___________.
combined
red
green blue
18.4 Color
When any two primary colors combine, a ____________ color is formed.
What secondary color do green and red light produce?
When red, green, and blue light combine, what color results?
Mixing Colors of Light
secondary
yellow
white
18.4 Color
Each secondary color of light is a combination of two primary colors.
The secondary colors of light are ____________, ______________, and _________________.
The Colors of Objects
cyan
yellow
magenta
18.4 Color
If you add a ________________ color to the proper ________________ color, you will get white light.
Two colors of light that combine
to form white light are
___________________ colors
of light.
The Colors of Objects
primary
secondary
complementary
18.4 Color
Mixing Pigments
The primary colors of ______________ are cyan, yellow, and magenta.
A pigment is a material that ______________ some colors of light and ___________ other colors.
Paints, inks, photographs, and dyes get their colors from pigments.
pigment
reflectsabsorb
18.4 Color
Mixing Pigments
When all of the pigments mix together, what color do they produce?
And when magenta and cyan mix?
Cyan and yellow?
Yellow and magenta?
black
blue
green
red
18.4 Color
Assessment Questions
1. A prism separates white light into the visible spectrum because a. longer wavelengths are absorbed more than shorter
wavelengths.
b. shorter wavelengths refract more than longer wavelengths.
c. shorter wavelengths reflect more than longer wavelengths.
d. longer wavelengths experience more interference.
18.4 Color
Assessment Questions
2. The color of an object depends on what the object is made of and on a. the intensity of light that strikes the object.b. the color of light that strikes the object.c. the direction of the light that strikes the object.d. the speed of the light that strikes the object.