Microscopes Flashcards
Describe what is meant by the magnification of an object
- How many times bigger an image appears than it’s actual size
What is the material that is placed under a microscope called
- An object
What is the appearance of the material when viewed under a microscope called
- An image
What are the two types of microscopes called (GCSE)
- Optical microscope
- Electron microscope
Describe what is meant by the resolution/resolving power of a microscope
- The minimum distance apart that two objects can appear as separate objects
The smallest organelle that can be viewed by a microscope is determined by:
A) Magnification
B) Resolution
- Resolution
Why does increasing the magnification sometimes result in a blurry image
- Beyond the limit of resolution, increasing the image further will result in the image looking blurry
Why can’t organelles like mitochondria be seen under an optical microscope
- The mitochondria is too small and the resolving power (resolution) is too low
A student cannot see the organelles of a red blood cell, explain why
Red blood cell has no organelles because their cytoplasm is filled with hämoglobin
What are the 3 types of microscopes you need to know about at A-level
- Optical microscope
- Scanning electron microscope (3D image)
- Transmission electron microscope (2D image)
What is the radiation source for optical microscopes
Light
What are the 2 lenses in a light microscope called
- Objective lens
- Eyepiece lens
What is the maximum magnification in a light microscope
X1500
How do you calculate the total magnification of an optical microscope
Eyepiece X objective
What is the maximum resolution in a light microscope
200nm