| MICROSCOPE ACTIVITIES |
| Act #1: The Cell Theory Background Read pg. 50-51 text A) What are the accomplishments of Galileo? Virchow? B) What is the cell theory? Act #2: The Microscope Make a sketch: Use the lab manual to identify the parts of a microscope. |
| Act #3: Simple vs. Compound Microscope Most microscopes don�t have just 1 lens; they have a system of lenses. One lens magnifies the already enlarged image of the other lens. A) What is the magnification of the ocular lens? B) What are the magnifications of the objective lenses? C) What is the magnification of the scanning lens? D) What is the magnification of the low power lens? E) What is the magnification of the high power lens? F) If you are using the lowest power of the objective lens, what is the total magnification? How about when you are using the highest power? Act #4: Making a Wet Mount Slide A) Punch out the "#1" sign from the teacher�s sheet. At the front of the room. B) Get a clean microscope slide and cover slip. C) Put the "#1 sign" in the center of the slide. D) Cover the specimen with 1 or 2 drops of water. E) Hold the cover slip at a 45-degree angle and bring it down slowly so the lower ledge touches the water. F) Lower the cover slip slowly onto the slide so there are no air bubbles. If there are bubbles, gently tap the cover slip with the end of your pencil. G) Bring up your wet mount slide for your teacher to check/give signature. Act #5: Field of Vision: Viewing the Specimen A) Why should you always use the stage clips to hold the slide? B) Why should you always begin observing the specimen with the lowest power? C) Move the stage all the way to the top. D) Use the coarse adj. to move the lens away. E) Get the "#1" sign in focus using the scanning lens. F) Is the position of the sign upside down or right side up? G) If you move the slide away slightly to the right how does the letter move? H) If you move the slide slightly foward, how does it appear to move? I) Switch from scanning to low power without lowering the stage. Use the fine adjust to focus. J) How did the field of vision change? Do you see a smaller or larger "#1sign"? K) Try switching to high power. L) Sketch the "#1 sign" in the field of vision on scanning, low power, and high power. Use a template to draw the circles on the back of this sheet of paper. Label the TOTAL magnifications for each. |
| Act #6: Depth of Field A) You will need your friends for this activity. B) You need two strands of hair. One dark and one light (blonde). Cut the strands so they are 1cm in length. C) Lay the blonde hair on the slide, then lay the dark strand on top; so that the two strands make a + or x figure. D) Sketch 4x, 10x, and 40x. E) Under the 4x, raise the stage to the top. Slowly lower the stage. Notice which hair you see clearly first- is it the dark or light? F) How can we use the microscope for depth of field? |