Magnification and Quantitive Units Flashcards
Equation: Magnification
Image size
—————
Actual size
What is magnification
The process of enlarging an image
What is resolution?
The ability to distinguish between two points as separate structures (level of detail)
What is a compound microscope?
A microscope that uses multiple lenses
What is the maximum magnification of a light microscope?
x2000
How do you calculated the overall magnification of a microscope?
Overall magnification = eyepiece magnification x objective magnification
What is a light microscope?
A type of microscope that uses lenses to magnify an image
What is an electron microscope?
A microscope that uses beams of electrons to form an image
What are the differences between light and electron microscopes? (3)
- Light microscopes use light, electron microscopes use electrons
- Electron microscopes have a higher resolution
- Electron microscopes have a higher magnification
How have changes in microscopes lead to us seeing things in the detail we do today?
- Compound microscopes was the first type invented
- Single lens microscopes then invented
- Optical quality of light microscopes increased over time but reached a point where magnification couldn’t get higher
- First electron microscope in 1931
What are the disadvantages of electron microscopes?
- Living cells cannot be observed since they have to be placed in a vacuum
- Expensive
What are the two types of electron microscopes?
- A Transmission Electron Microscope (TEM)
- A Scanning Electron Microscope (SEM)
What is one mm in metres?
1x10-3
What is one μm in metres?
1x10-6
What is one nm in metres?
1x10-9