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Cells

Defining Life

 

The Microscope

 

The Cell

 

The Cell's

Alive

 

Cells in Organisms

Ecology

Matter and Energy Cycles

 

Organsim Interactions

 

Plant and Animal Adaptations

Genetics

DNA and Chromosomes

 

Traits

 

Sexual and Asexual Reproduction

 

Punnet Squares

Evolution

Evidence

 

Natural Selection

 

Artificial Selection

Human Body

Cells to Body Systems

 

Nervous Systems

 

Immune System

 

Life Science Links

 

The Microscope

Parts of the Microscope

How Much are you Magnifing By?

You have 2 lens that you are looking through in a micoscope.

Lens 1: The Eyepiece

Makes things look 10X times bigger

 

Lens 2. The Objective Lenses

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We have three different objective lenses but we can only use one at a time.

Our objective lenses can do 4X, 10X, and 40X.

To figure out how much total magnification you see, use multiplication.

The x next to the number means how many "times" it is magnified.  For example, 40x reads as "forty times" which means that the image you are looking at is 40 times bigger then in real life.

  Objective Eyepiece Total Magnification
Low Power
4x
10x
40x
Medium Power
10x
10x
100x
High Power
40x
10x
400x

Every picture that is drawn or photographed should be marked with the magnification!

 

Focusing a Microscope

1. Make sure you are using the lowest power objective lens (that would be the shortest one)

2. Use only the Coarse Adjustment (large knob)

3. Raise the stage until it almost touches the lens

4. Center the object in the middle of the circle of light (use your hands to move the object around)

5. Use the Coarse adjustment knob to lower the stage until the object is in focus

** If you cannot find the object or focus on the first try then repeat steps 1-5.

*** After you complete steps 1-5 with an object in focus then you may use a high power objective

DO NOT USE THE COARSE ADJUSTMENT KNOB WITH HIGH POWER OBJECTIVES!!!

 

What You See Changes

Human Eye 0X

Low objective,red objective

40x

Medium objective, yellow objective

100x

High objective, blue objective

400x

 

How to See

 

What You Are Looking For

Lets say you want to see a leg of a insect under a higher power.

Right now it is off to the right in low power.

Move the slide until what you want to see is in the center.

Then move your objective to a higher power and refocus using the fine adjustment knob.

Learn More

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