Transparent Transmits light without distortion Ex: crystal clear water
Translucent Transmits light but the image is distorted Ex: lampshade
Opaque Transmits no light All light is absorbed or reflected Ex: brick
White Light Produced by adding the colors red, blue and green This is called the additive process Red, blue and green are called the primary light colors
Mixing Light Colors Red and Green = Yellow Blue and Green = Cyan Red and Blue = Magenta
Complementary Light Colors Yellow and Blue Produce white light Cyan and Red Magenta and Green
Dyes and Pigments Dyes are molecules that dissolve in liquids to form colored solutions. They absorb certain wavelengths and reflect others. A pigment also absorbs certain wavelengths and reflects others, but they are larger and mix to form suspensions.
Dyes and Pigments The absorption process of light forms colors by the subtractive process
Primary Pigments Absorb one color from white light and reflect 2 colors Yellow absorbs Blue Reflects red and Green Magenta absorbs Reflects Blue and Red Green Reflects Blue and Green Cyan absorbs Red
Secondary Pigments Absorb 2 colors from white light and reflect one color Red absorbs Green Reflects Red and Blue (Cyan) Green absorbs Red Reflects Green and Blue (Magenta) Reflects Blue Blue absorbs Red and Green (yellow)
Complementary Pigments Produce black light Black is not a color just the absence of light No light is being reflected Note: The primary light colors are the secondary pigments and vice versa
What color would a yellow bananaappear if it is hit with green light? Answer: Green, yellow can reflect red and green, but there is only green light hitting it.
What color would a yellow banana appear if it is hit with blue light? Answer: Black, the yellow absorbs blue light so there is no light to reflect
What color would a yellow banana appear if it is hit with cyan light? Answer: Green, the yellow absorbs blue light Cyan – Blue = Green
Polarized Light Light that only vibrates in one plane. Polarized light will only pass through a polarized filter if it is parallel to the vibrating light
Thin Film Interference The beautiful colors are caused when light reflects off of 2 surfaces Example: Oil and water or the 2 layers of a bubble