Our class learnt the different types of microscopes: light microscopes(the one we used), Electron Microscope and more! We learnt how to calculate the magnification (eyepiece 10X multiplied by various objective lenses) and there were three objective lenses: scanning objective lens, low objective lens and high-power objective lens.(ascending order) Next, we learnt how to prepare a slide(which was to be put on the stage of the microscope later on).
Here are the steps:
1. Wash the glass slide thoroughly under running water. (You don't want to see thumbprints on the glass slide under the microscope!!) **You must must hold it by its sides, not the wide glass surface**
2. After you have dried all the water off the glass slide, put the substance you want to observe under the microscope.
3. For me, it was newspaper. So I had to put some water because newspaper is a solid substance. (If it is not coloured, [like cheek cells] you will have to put a drop of iodine solution or a colored liquid!)
(If it is in liquid form already, you do not need to put any any thing.)
4. Next, carefully slide the cover slip down onto the glass slide! (you don't want to see any huge air bubbles under the microscope! You will see a black line) (I had experienced this before; I saw some black dots under the microscope and mistook it for the substance.__.) To prevent any air bubbles, you will have to use a sharp object (I have been using toothpicks) to drag the cover slip along the glass slide.
5. We have finally prepared the slide!:D
So after so many adjustments of the stage....
I came up with this wonderfully huge picture of the newspaper and the three fibered strings! (the newspaper was [] <--this size)
 |
| A tiny piece of newspaper with the letter 'S' under a microscope The letter 'S' is upside-down and laterally inverted! |
 |
| 3 different coloured strings under a light microscope. If you focus on one string, the other strings will look blur! |
No comments:
Post a Comment