Brainteaser The more of them you take, the more you leave behind. What are they? Answer Here!

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Parts of the Microscope and Their Function

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Presentation transcript:

Brainteaser The more of them you take, the more you leave behind. What are they? Answer Here!

Today you will learn The 3 different types of microscopes used in Biology. How to care for a microscope The parts of the microscope How to use a microscope

Introduction to the Microscope Students will have their microscopes out, for reference as we go through each of the steps. As an introduction, students will be asked what kinds of things they can do with this tool.

3 Main Types of Microscopes Stereo Dissecting Scope Compound Light Microscope http://www.udel.edu/biology/ketcham/microscope/scope.html Electron Microscope http://school.discoveryeducation.com/lessonplans/interact/vemwindow.html

Stereo Dissection Microscope Used for low magnification of three-dimensional objects- objects larger or thicker than the compound microscope can accommodate. Magnify from about 10X up to 40X

Compound Light Microscope Light passes through lenses to magnify image up to 1000X Can observe living cells

Electron Microscope Uses a beam of electrons to magnify image > 1000X Kills cells being observed

3 Main Types of Microscopes Stereo Dissecting Scope Compound Light Microscope http://www.udel.edu/biology/ketcham/microscope/scope.html Electron Microscope http://school.discoveryeducation.com/lessonplans/interact/vemwindow.html

Microscope Care Always carry with 2 hands Only use lens paper for cleaning Do not force knobs Always store covered Keep objects clear of desk and cords Teacher demonstrates how to hold the microscope, where the lens paper is located and how to use it. Students will be invited to turn the knobs and observe the stage as it moves up and down. Teacher will demonstrate how to store the microscope.

What’s my power? To calculate the power of magnification, multiply the power of the ocular lens by the power of the objective. What are the powers of magnification for each of the objectives we have on our microscopes?

Magnification The magnification written on the ocular lens (eyepiece) is _____________ 2. The magnification on the Scanning objective ___________ Low Power Objective ___________ High Power Objective ___________ 3. What is the total magnification for each lens (multiply ocular times objective) Scanning _____________ Low Power ______________ High Power ________________

Using the Microscope Place the Slide on the Microscope Use Stage Clips Click Nosepiece to the lowest (shortest) setting Look into the Eyepiece Use the Coarse Focus Give students a slide from the “common things” set, each student will practice focusing and changing objectives.

Using High Power Follow steps to focus using low power Click the nosepiece to the longest objective Do NOT use the Coarse Focusing Knob Use the Fine Focus Knob to bring the slide Have students exchange slides so they can look at different things, walk them through using the high power objective to focus slides. Emphasize not using the coarse objective during this process, as it will crack the slides. What can you find on your slide?

How well did you do today? If the objective lens on your microscope is set at a magnification of 4x (scanning power), what is the total magnification of the image you are viewing? _________ A = 4x B = 40x C = 400x D = 10x

Practice http://school.discoveryeducation.com/lessonplans/interact/vemwindow.html