| A | B |
| Leeuwenhoek | "animalcules" |
| Ocular lens | eyepiece |
| lens | curved piece of glass |
| Computed Tomography | CT scan |
| Refracting Telescope | uses a series of lenses to focas light |
| x-rays | lets you x-ray things you can't see |
| bathyscaph | self propeled submerine |
| bathysphere | small diving vessal attached to a ship |
| barometer | divice that measures air pressure |
| seismograph | measures and detects earthquakes |
| Alvin | bathyscaph |
| magnifing glass | simple optical microscope |
| high power lens | 40x |
| low power lens | 4x |
| middle power lens | 10x |
| corse adjustment knob | moves the stage alot |
| fine adjustment knob | moves the stage a little at a time |
| reflecting telescope | uses a series of mirrors |
| Hale Telescope | Mount Palomar, California |
| The Multiple Mirror Telescope | Mount Hopkins, Arizona |