A student places a piece of glass over a tank of water. what happens to the speed of a light ray that shines from the air through glass into the water?
a. the speed of light increases in glass, then increases in water because as the density of a substance decreases the speed of light speed of light increases in glass, then increases in water because as the density of a substance decreases the speed of light decreases.
b. the speed of light decreases in glass, then increases in water because as the density of a substance increases the speed of light speed of light decreases in glass, then increases in water because as the density of a substance increases the speed of light decreases.
c. the speed of light increases in glass, then decreases in water because as the density of a substance increases the speed of light speed of light increases in glass, then decreases in water because as the density of a substance increases the speed of light increases.
d. the speed of light decreases in glass, then decreases in water because as the density of a substance decreases the speed of light increases.