Transcript BEHAVIOR OF LIGHT - Kent City School District

BEHAVIOR OF LIGHT
When light strikes an object it is…
Reflected
Transmitted
Absorbed
REFLECTION
Light waves bounce off of a surface
TRANSMISSION
Light waves travel THROUGH an
object.
ABSORBTION
Light waves do NOT bounce off or
pass through an object.
How light behaves when it strikes on object
depends on many factors, including what the
material is made of.
Transparent-A material through which
you can see CLEARLY.
Most of the light that
strikes a transparent object
PASSES THROUGH
Translucent-A material that scatters
light and causes objects to appear
fuzzy.
These materials allow light to pass
through but they also scatter the light.
Opaque-A material that either absorbs
or reflects all light that strikes it.
REFLECTION
When light waves bounce off of a surface
IMAGE- A copy of an object formed by reflected
waves of light.
REFLECTION
Rough surfaces reflect light in ALL directions.
Smooth surfaces reflect light in ONE direction.
Law of Reflection
Angle of incidence = Angle of reflection
VIRTUAL IMAGE
The image that appears to be
“ IN THE MIRROR”
.
Virtual Image
The virtual image appears to be as far
behind the mirror as you are in front of
the mirror.
REFRACTION
Light waves BEND as they pass from
one MEDIUM
to another at an
ANGLE.
Refraction
Makes objects appear LARGER & CLOSER
than they really are.
Refraction
Makes objects appear to BREAK at the surface
of the water.
PRISMS
Bend WHITE light and separate it into the
VISIBLE LIGHT SPECTRUM.
Longer waves are refracted LESS than shorter
waves.
POLARIZATION
Unpolarized light VIBRATES in all DIRECTIONS.
Polarization
A VERTICAL polarizing filter stops waves that
are vibrating on a horizontal plane.
A HORIZONTAL polarizing filter stops waves that
are vibrating on a vertical plane.
SCATTERING
Light is redirected as it passes through a
MEDIUM
COLOR
The color of an object depends on 2 things
1. What the object is made of
2. The color of light that strikes the
object
Primary Colors of Light
RED
GREEN
BLUE
Mixing Primary Colors
Red + Green
Yellow
Red + Blue Green + Blue
Magenta
Cyan
All 3
White
Primary colors combine to
produce WHITE light
Complementary Colors
Two colors that combine to form white light.
Subtractive Colors-Pigments
A material that ABSORBS some colors and
REFLECTS other colors.
Primary Colors of Pigments
CYAN
MAGENTA
YELLOW
Combining of primary pigments
How does it work?
The color of an object is determined by the colors of
light it absorbs and the colors of light it reflects.
When white light falls on a red object, the object
appears red because its surface subtracts (absorbs) all
colors of light except red.
The light that is absorbed (subtracted) is transformed
into heat. This explains why a black object, which
absorbs all of the colors of light hitting it, gets much
hotter in sunlight than a white object that reflects all
colors
Additive vs. Subtractive Color