microscopes

• The stage is the platform where the specimen is placed for observation.
• There are 2 types of microscopes: electron and light.
• all things are made of cells
• the first light microscopes were developed in the mid 17th century.
• Light microscopes use a beam of light to form an image of an object.
• Light microscopes can at best magnify around 2000 times.
• The electron microscope was made in the 1930s.
• The electron microscope allows us to see the internal structures of cells and organelles.
• Light microscopes only allows us to see living things and are used to observe cells and tissues.
• Electron microscopes use a beam of electrons to form an image
• Electron microscopes can magnify objects up to 2000000 times.
• There are 2 types of electron microscopes: Transmission electron microscopes and Scanning electron microscope
• Transmission electron microscopes give 2D images of specimens with high magnification and resolution.
• Scanning electron microscopes give dramatic 3D images with lower magnifications.
• eyepeice magnification x objective lens magnification = overall magnification
• Image size = magnification x size of real object
• size of real object = size of image / magnification
• magnification = size of image / size of real object
• Resolution is the ability to distinguish between two separate points.
• It is the resolving power of a microscope that affects how much detail it can show.
• An light microscope has a resolving power of about 200nm
• A scanning electron microscope has a resolving power of about 10nm
• A transmission electron power has a resolving power of about 0.2nm.
• 1 kilometre (km) = 1000 metres (m)
• 1m = 100 cm
• 1cm = 10millimetres (mm)
• 1mm = 1000 micrometres (μm)
• 1 micrometre = 1000 nanometres (nm)