Содержание
- 2. Microscope Measurement How big is that object in the microscope?
- 3. Lesson Objectives Calculate the magnification using different objective lens. Differentiate between eyepiece graticule and the stage
- 6. Light Microscope A light microscope (also, optical microscope) is an optical instrument used to make objects
- 7. Electron Microscope An electron microscope is an optical instrument that uses a beam of electrons to
- 9. Light microscope vs Electron microscope What is the difference between a light microscope and an electron
- 10. What is happening to the image as you increase the power of the objective lens?
- 11. Calculating total magnification If two lenses are always magnifying the specimen, how do you figure out
- 12. How do we find the overall magnification of a light microscope? Eyepiece Objective lens 40 100
- 13. 1000 1000 1000 1000 mm Micrometre nm
- 14. 0.001 0.000001 1000 0.001 1 000 000 1000 3000 0.003 0.007 0.000007 500 000 500
- 16. The diagram below is a drawing of an organelle from a ciliated cell as seen with
- 17. Calculating actual size: Size of the magnified image > actual size
- 18. To accurately measure the size of cellular structures we need a suitable scale:
- 19. Field of View When you look into a microscope, the “field of view” is the visible
- 20. Estimating Specimen Size The area of the slide that you see when you look through a
- 21. Ideally, we need a scale we can see directly alongside the cells we are observing:
- 22. Eye piece graticule or reticule It is a glass or plactic disc with 8 divisions etched
- 23. Stage Micrometer simply a microscope slide with a finely divided scale marked on the surface. 1
- 24. Instructions Take sample of onion cell (peel of the onion) Add a drop of water Cover
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