Presentation on theme: "Color. COLOR The Color Spectrum Sun light is an example of white light. When passed through a prism, it gives the above colors. Under white light, white."— Presentation transcript:
COLOR The Color Spectrum Sun light is an example of white light. When passed through a prism, it gives the above colors. Under white light, white objects appear white and colored objects appear in their individual color.
White is not a color but a combination of colors. Black is not a color itself, but the absence of light. Color by reflection The color of most objects around us are due to the way the objects reflect light. Most materials absorb some frequencies and reflect the rest. Ex. A material appears red when absorbs most visible frequencies but reflects red. If material reflects all visible frequencies it will appear white, if it absorbs all the light, it reflects none back and is black. The reflected colors of most objects are not pure single- frequency colors, but a composed of a combination of frequencies.
Color by transmission The color of a transparent object depends on the color of the light it transmits. Ex. A red glass appears red because it absorbs all the colors of white light, except red. The material in the glass that selectively absorbs colored light is known as a pigment. Transparent__Translucent__and_Opaque.asf Sunlight White light from the sun is composed of all visible frequencies. Yellow-green is the brightest part of sunlight. YouTube - How a Rainbow Works Fig 28.8 p404
Mixing colored light White results from mixing all visible frequencies or by combining only red, green, and blue light. Complementary colors Two colors of light which when added appear white. If you begin with white light and subtract some color from it, the resulting color will appear as the complement of the one subtracted. Mixing colored pigments Colored mixing by subtraction is the mixing of colored paints or dyes, which absorb most frequencies except for the ones that give them their characteristic color.
Why the sky is blue? Why the sunsets are red? Why water is greenish blue? YouTube - Why Is the Sky Blue? Read p409 The atomic color code-Atomic Spectra Atoms of each element have characteristic line spectra that can be used to identify the element.