- When laser light, must travel long distance or hard-to-reach places, _________ are used
- Lasers produce__________ light in which the waves are aligned and travel in the same direction
- ___________ when a wave strikes an object and bounces off of it
- The __________ is the angle between the reflects ray and the normal
- objects must _______ light in order to be seen
- Objects appear to be __________ because they absorb all colors of visible light
- The law of ___________ states that the angle of incidence always equals the Angle of Reflection
- _____________ waves travel faster than sound waves
- The ____________ is the angle between the incident ray and the normal
- ___________ waves travel faster in gases and empty space than in liquids and solids
- What is elastic potential energy measured in?
- What is gravitational potential energy measured in?