Transcript Document
LIGHT
AND
COLOR
Dispersion – white light breaks down
into its components
Opaque
Translucent
Transparent
?
Light and Color
When light strikes an object, the light can be …
• Reflected
• Absorbed
• Transmitted
>
Opaque
Transparent
Translucent – scatter as
the light is
transmitted
An opaque object is the color of the light it . . .
Reflects
A Transparent or Translucent object is the color of light it …
Transmits
Primary Colors of Light are . . .
Red Blue Green
Secondary Colors of Light contain equal amounts of
two Primary Colors
Yellow = Red + Green
Cyan = Green + Blue
Magenta = Red + Blue
WHITE LIGHT
Red + Blue + Green = White
PIGMENTS
• Colored substances used to color other materials
– inks, paints, dyes
• The color of a pigment is the color it reflects
• The primary colors of pigments are
cyan
magenta
secondary red
blue
yellow
green
• More pigments combined = darker colors
– less light reflected, more absorbed
Reflection and Mirrors
Regular Reflection
Light reflects off a smooth surface
Diffuse Reflection
Light hits a bumpy or uneven surface
Plane Mirror
• Produces a Virtual Image
• A copy that is upright and actual size
Concave Mirror
• Produces a real image that is upside down when
reflected rays meet
• Produces a virtual image that is upright and larger
than the object when object is between focal
point and mirror
Convex Mirror
• Produces an image that is always virtual and smaller
that the object because the rays never meet
Refraction = when light rays enter a new medium,
the change in speed or direction causes
them to bend
Index of Refraction = how much the ray of light bends
when it enters a material
Mirage = light travels faster through hot air than
through cool air. Light rays closer to the
ground may be hotter causing the light to
bend more.
LENSES
A curved , transparent material that is curved
to refract light
Convex - real or virtual image
Concave - virtual image