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.

Transparent-A material through which you can see CLEARLY. 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 Red + Blue Green + Blue All 3 Yellow Magenta Cyan 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