Chapter 3 – Light 3.1 Light and Color

I. Essential Question: What determines color? How do colors combine?

II. Key Vocabulary Transparent: a material that allows light through Translucent: a material that allows some light through Opaque: a material that does not allow light through

II. Key Vocabulary Primary color: colors that combine to make any other color. Secondary color: colors created by two primary colors. Complementary color: any two colors that combine to form white light. Pigment: colored substances used to color other materials.

III. Key Concepts The color of an opaque object is the color of the light that it reflects. Objects can appear to change color if they are viewed in different colors of light. The color of transparent or translucent objects is the color that it transmits. Used to make color filters.

III. Key Concepts Primary colors of light – red, green, and blue; when they are combined equally they form white light. Secondary colors of light – yellow (red/green), cyan (green/blue), and magenta (red/blue). Primary + secondary = white light

III. Key Concepts The more pigments that are combined, the darker the mixture looks. Cyan, magenta, and yellow are the primary colors of pigments. When combined equally, they make black. Red, green, and blue are the secondary colors of pigments.