vibrations of matter
ROYGBIV - the very small part of the light spectrum that we can see
When light changes direction and speed (bends) because it goes through something different.
When light bounces off a shiny, smooth surface.
A curved peice of glass or plastic that bends (refracts) light to make things seem bigger, smaller, closer or farther away.
blocks all light (example. tree trunk)
allows light to pass through easily (example - glass)
allows some light to pass through. (example - wax paper)