| A | B |
|---|
| Light rays | usually travel in imaginary straight lines called light |
| Rays | thin lines of light |
| Transparent | is something that allows light to pass through it easily and cleary |
| Opaque | anything that allows no light to pass through |
| Translucent | objects let SOME light but scatter the rays so that something on the other side cannot be seen clearly |
| Reflection | is the bouncing of light off a surface that it strikes |
| Reflection ray | a thin line of light bouncing of another object |
| Image | when rays travel in a straight line after hitting an object |
| Luminous or Luminescent | objects that can give off their own light |
| Refract | bend |
| Refraction | bending of light happens when passing through one transparent material to the next |
| Refractive index | how much a substance bends light |
| Lens | a specially shape piece of glass or other transparent material |
| Convex lens | thick in the middle than on the edges;bends parellel rays of light |
| Concave lens | thicker on the edges than on the middle;separates rays of light |
| Prisms | refracts white light into the colors of the spectrum |
| Spectrum | the colors that make up white light |
| Spectroscope | a device that scatters colors by bending them at different angles |
| Kaleidoscope | an instrument made with mirrors |
| Galileo Galilei | first telescope |
| Robert Hooke | reflecting telescope;discovered plant cells using early microscope |
| Anton van Leewenhoek | made lens with magnifying powers |
| Isaac Newton | Discovered white light is a mixture of colors |
