1. Angle of incidence=
     optical density
     angle of reflection
     index of refraction

2. A reflection of a surface that is not smooth is called a
     diffuse reflection
     sharp reflection
     total internal reflection

3. The higher the optical density of something, the ______ a time light has getting through it
     harder
     easier
     faster

4. The optical density is also known as the
     index of reflection
     index of incidence
     index of refraction

5. Optical density can be found by dividing the speed of light by
     the speed of sound
     the speed of light in the substance
     the temperature of the substance

6. The sine of angle of incidence divided by the sine of angle of refraction equals optical denisty is called
     Snell's law
     Newton's law
     Bernouli's principle

7. The perpendicular to where light hits a substance is called
     the index of reflection
     the angle of refraction
     the normal

8. Optical fibers work because of
     Bill Gates
     rainbows
     total internal reflection

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