Chapter 1 Section 4 Tools and Techniques (specifically microscopes) p. 21-22.

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Presentation transcript:

Chapter 1 Section 4 Tools and Techniques (specifically microscopes) p

Microscopes Tools that extend human vision by enlarging images of objects

Microscopes Microscopes study specimen  Specimen: a small sample or part taken to show the nature of the whole

Types of Microscopes 1.Light Microscope 2.Scanning electron microscope (SEM) 3.Transmission Electron microscope (TEM)

Compound Light Microscope Shine a light through a specimen  The specimen has to be thin enough for light to pass through Has two lenses to magnify the image Can see cells and large organelles Specimens may be living

Parts of the Microscope Ocular Lens Coarse Focus Fine Focus Objective Lens Stage Light Source

Parts of the Microscope Ocular Lens: typically magnifies the image 10x Coarse Focus: used primarily to focus on your specimen  This is never, ever, ever, ever to be used on the high power objective lenses!!!!! Fine Focus: used to get the clearest focus Objective Lens: main lens that enlarges the image; light passes through this lens first Stage: platform that supports the slide Light Source: provides the light for viewing

How to Carry a Microscope

Electron Microscopes Specimens must be dead Can see small organelles, viruses, phages and atoms! Two types 1. Scanning Electron Microscope (SEM)  A beam of electrons passes over the surface of a specimen creating a 3-D image

SEM pictures

Electron Microscopes Two types 2. Transmission Electron Microscope (TEM)  Beam of electrons travel through the specimen and is focused by magnets

TEM pictures Aluminum atoms

TEM pictures Gold Atoms

Homework Read pages pg. 24, Problem #'s 2, 3, 7 and 9