| A | B |
| light | a form of energy that travels in a straight line |
| sunlight | natural light/primary source of light |
| artificial light | light not from the sun |
| reflection | light can bounce off one object to another |
| refraction | light rays can bend |
| opaque | will not allow light to pass through |
| translucent | allows some light to pass through |
| transparent | allows all light to pass through |
| solar eclipse | when the moon passes between the earth and the sun |
| lunar eclipse | when the moon passes through some portion of the earths shadow |