B1 - Cell Structure and Transport magnification (copy)

How many metres in 1km?

1km = 1000m

How many centimetres in 1m?

1m = 100cm

How many millimetres in 1cm?

1cm = 10mm

How many micrometres in 1mm?

1mm = 1000μm

How many nanometres in 1μm?

1μm = 1000nm

How do light microscopes form images?

Light microscopes use a beam of light to form images.

What is the maximum magnification of a light microscope?

The best light microscopes can go up to x2000.

What are some characteristics of light microscopes?

Light Microscopes:

• are relatively cheap

• can magnify live specimens

How do electron microscopes form images?

Electron microscopes use a beam of electrons to form images.

What is the maximum magnification of an electron microscope?

The best electron microscopes can magnify up to x2,000,000.

What are some characteristics of electron microscopes?

Electron Microscopes:

• can see subcellular structures inside cells

• are large

• are very expensive

• must be kept in special temperature, pressure, and humidity

What are the 2 types of electron microscopes?

Transmission Electron Microscopes

Scanning Electron Microscopes

What are some characteristics of Transmission Electron Microscopes?

Transmission Electron Microscopes:

• have very high-resolution

• can reach very high magnification

• 2D

What are some characteristics of Scanning Electron Microscopes?

Scanning Electron Microscopes:

• Lower magnification

• 3D

What are the equations for magnification?

Magnification = Eyepiece Lens Magnification x Objective Lens Magnification.

Magnification = Size of Image / Size of Real Object

What is the resolving power of a microscope?

The resolving power of a microscope is how much detail it can show.

What is the resolving power of:

• A Light Microscope?

• A Transmission Electron Microscope?

• A Scanning Electron Microscope?

The resolving powers of:

• A Light Microscope - about 200nm

• A Transmission Electron Microscope - about 0.2nm

• A Scanning Electron Microscope - about 10nm