Microscopes

by briana145
Last updated 7 years ago

Discipline:
Science
Subject:
Technology
Grade:
11

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Microscopes

Light Microscope

It uses light to make small objects visible

These microscopes can view bacteria, which is consindered the smallest living form.

Preparation:1. Place liquid on slide2. Put sample on liquid3. Pace one side of the cover slip against the slide4. Lower the cover, avoid bubbles

Pros: Can view live cells, produces colour images

Cons:Cannot magnify more than 2000x

Electron Microscopes

Pros: Can magnify up to 200,000xCons: Expensive, difficult to use, cannot look at live forms

Used to view dead or living objects up to 200,000x its original size.

Preparation for Electron:1. Cut sample into cross sections2. Fix and dehydrate3. Embed in hard resin4.Ultramicrotome cuts the samples into ultra-thin slices (100 nm or thinner).


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