1.1 - The World of The microscope

Light microscopes

• use a beam of light to form an image of an object

• can magnify up to x2000

• relatively cheap

• can be used almost everywhere

• can magnify live species

Electron microscopes

• use a beam of electrons

• can magnify up to x2000000

• large

• expensive

• have to be in specific environments

magnification calculation

eyepiece lens x objective lens

magnification triangle

image size/magnification x real size

Resolution

The ability to distinguish between 2 separate points

Resolving power of light microscope

200nm

Resolving power of electron microscope

0.2nm

micrometres in a mm

1000

nanometres in a micrometre

1000nm

magnification

by how much an image is enlarged

micro - graph

photo taken from microscope

specimen

anything looked at with a microscope