1.5 Technological Advances of the Microscope

(Text pages 17 and 18)

Key Ideas

• What are the different types of microscopes and how are they used?

1. Single- lens microscope (SLM)- The year 1660’s- 1 lens = 10x magnification

2. Compound light microscope (CLM)- The year 1857- FSJSS- 2 lenses- Glass lenses and light- Increasing thickness of lens=

increasing mag. (can become blurry)- Max mag. = 2000 x- Any part of cell can be seen

3. Transmission electron microscope (TEM)

- The 1930’s- 2 000 000 x mag.- electrons (not light) pass through

cells- very thin slices of cells- dead cells

4. Scanning electron microscope (SEM)- In the 1980’s- Electrons bounce off of cells- Thickness does not matter- Only 3 D images (out side of cell)- Less mag. than TEM