Exploring Life 1.3.

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Presentation transcript:

Exploring Life 1.3

Development of Microscopes The invention of microscopes enabled people to see details of living things that they could not see with the unaided eye. Robert Hooke discovered cells. Anton Van Leeuwenhoek made improvements to the Hooke’s microscope.

Types of Microscopes All microscopes magnify objects. Magnification makes an object appear larger than it really is. Microscopes also have resolution – how clearly the magnified object can be seen. Two Main Types: 1. Light Microscopes 2. Electron Microscopes

Light Microscopes Uses light and lenses to enlarge an image of an object. Simple Light Microscopes only have one lens A compound microscope has more than one lens. * A compound microscope has an objective lens which magnifies the image and the ocular lens magnifies it even more.

Light Microscopes Can enlarge objects up to 1500 times their original size. Can view living and nonliving objects.

Electron Microscopes Use a magnetic field to focus a beam of electrons through an object or onto an object’s surface. Electrons are tiny particles inside atoms. Can magnify an image up to 100,000 times or more. Resolution is up to 1,000 greater than a light microscope

Electron Microscopes 2 types of electron microscopes: 1. Transmission Electron Microscopes (TEM) 2. Scanning Electron Microscopes (SEM) TEM are usually used to study extremely small things. Ex. Cell organelles Only dead organisms can be viewed with a TEM. Electrons pass through the object and a computer produces an image of the object.

SEMS Are usually used to study an object’s surface. Electrons bound off the object and a computer produces a 3D image of the object.

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