1. Chapter 16-2
Light and Matter

2. Color: the dispersion of white light into the color spectrum ROYGBIV

3. Newton did the first experiments demonstrating that white light contained all the colors in the spectrum

4. Light Transmission Terminology
Transparent
materials that transmit light waves without distorting images, e.g., glass
Translucent
materials that transmit light but do not permit objects to be seen clearly, e.g., tissue paper
Opaque
materials which transmit no light, e.g., brick

5. Color by Addition Primary Light Colors: Red, Blue, Green
Secondary Light Colors:
Magenta = red + blue
Yellow = red + green
Cyan = blue + green

6. Color by Addition

7. Color Addition

8. Color Addition

9. Color Addition

10. Color Addition

11. Color by Subtraction
Primary pigments: absorb one primary color from white light: (yellow, cyan, magenta) and reflect two primary colors
Secondary pigment: absorb two primary colors from white light: red, green blue
Difference between dye and pigment:
Dye-- a (molecule) that absorbs certain wavelengths of light,
Pigment-- (particle)—colored material that absorbs certain wavelengths

12. Color by Subtraction

13. Thin Film Interference
any film thickness equal to an odd multiple of quarter wavelengths will reinforce a given color.
The spectrum of colors produced by an oil film on water is due to interference.

14. Polarization of Light Unpolarized light vibrates in all planes
polarized light all vibrates in a particular plane

15. In a: only vertically polarized light is transmitted In b: only horizontally polarized light is transmitted

16. Polarization by Reflection
Light reflecting off horizontal surfaces is horizontally polarized
Vertically polarized sunglasses will cut down glare (filter out the horizontally polarized light)

17. End 16-2