Transcript Document
LIGHT AND COLOR Dispersion – white light breaks down into its components Opaque Translucent Transparent ? Light and Color When light strikes an object, the light can be … • Reflected • Absorbed • Transmitted > Opaque Transparent Translucent – scatter as the light is transmitted An opaque object is the color of the light it . . . Reflects A Transparent or Translucent object is the color of light it … Transmits Primary Colors of Light are . . . Red Blue Green Secondary Colors of Light contain equal amounts of two Primary Colors Yellow = Red + Green Cyan = Green + Blue Magenta = Red + Blue WHITE LIGHT Red + Blue + Green = White PIGMENTS • Colored substances used to color other materials – inks, paints, dyes • The color of a pigment is the color it reflects • The primary colors of pigments are cyan magenta secondary red blue yellow green • More pigments combined = darker colors – less light reflected, more absorbed Reflection and Mirrors Regular Reflection Light reflects off a smooth surface Diffuse Reflection Light hits a bumpy or uneven surface Plane Mirror • Produces a Virtual Image • A copy that is upright and actual size Concave Mirror • Produces a real image that is upside down when reflected rays meet • Produces a virtual image that is upright and larger than the object when object is between focal point and mirror Convex Mirror • Produces an image that is always virtual and smaller that the object because the rays never meet Refraction = when light rays enter a new medium, the change in speed or direction causes them to bend Index of Refraction = how much the ray of light bends when it enters a material Mirage = light travels faster through hot air than through cool air. Light rays closer to the ground may be hotter causing the light to bend more. LENSES A curved , transparent material that is curved to refract light Convex - real or virtual image Concave - virtual image