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When Light Strikes an Object
• When light strikes an object, the light can be reflected, transmitted, or absorbed
• Most objects can be classified into three different categories
1. Transparent2. Translucent3. Opaque
Transparent Materials• Transmits most light that strikes it• Light passes right through without being
scattered • Transparent materials allow you to see clearly
what is on the other side – Examples: Clear glass, water, air
Translucent Materials
• Scatters light as it passes through• Can see things behind a translucent object,
but the details are blurred– Examples: Wax Paper & Frosted Glass
Opaque Materials
• Reflects or absorbs all of the light that strikes it– Light CANNOT pass through
• Cannot see through opaque objects– Examples: Wood, Metal, tightly woven fabric
The Colors of Objects
• The color of an object depends on two things1. The material the object is made from2. The color of light striking the object
Color of Opaque Objects
• Depends on the wavelengths of light that the object reflects – The color of an opaque object is the color of the
light it reflects
• Objects can appear to change color if you view them in different colored lights.
Color of Transparent and Translucent Objects
• The color of transparent and translucent objects is the color of light it transmits
• Transparent and translucent materials are used to make color filters – Example: Lenses in sunglasses are color filters
Combining Colors
• Three colors that combine to make any other color are called primary colors– Red, Green, Blue
• Two primary colors that combine in equal amounts produce secondary colors
Mixing Colors of Light• Any two colors that combine to create white
light are called complementary colors– Examples: Yellow and Blue or Cyan and Red
• A color television produces many colors using only the three primary colors of light – By varying the brightness of each colored bar, the
TV can produce thousands of colors
Mixing Pigment
• Inks, paints, and dyes have pigments– Pigments are colored substances that are used to
color other materials – Pigments absorb some colors and reflect others – As pigments are added together, fewer colors of
light are reflected and more are absorbed • The more pigments that are combined the darker the
mixture looks