Activity 8B: Introduction to Microscope

Challenge Question:

What is the correct way to use a microscope?

Background: Read p C-22 in the lab packet and write down two facts.

Vocabulary:

Microscope: a device used to magnify small images

Magnify: to enlarge an image; to make bigger

White Space ?:

Why do you think it is important for scientists to use microscopes? Give at least 3 reasons.

Activity 8B: Introduction to Microscope

• Materials: Read over the list on p C-23

• Procedure: Read p C-24 to C-26 and check off if you understand

• Data: Draw your images on your Observation/Data Sheet. Label each part of your picture, including the objective.

Clean Up Directions

• Set stage as far down as you can and objectives to low power

• Unplug and wrap cords

• Put slides/coverslips away

• Throw all used/wet papers (e’s & comics) away

• Come get new lens paper

• Pour out water in sink and dry cup. Get fresh paper towel

Activity 8B: Introduction to Microscope

Analysis Questions: Answer questions #1-3 on page C-26 in lab packet

Conclusion: What have you learned about microscopes? What was easy for you? What was difficult for you? 4-5 sentences

Notes to Self: Finish the microscope worksheet & packet!

Activity #8B

Introduction to Microscope

Parts of a Microscope Notes

Eyepiece or Ocular:

Where you _________________ to see the image. Magnifies image 10x.

Body Tube:

_________________ that holds the eyepiece up above the microscope. It allows the light to travel through the microscope.

look into the microscope

Long, skinny tube

Nosepiece:

The nosepiece holds the _two or three__ objective lenses. It ____________.

Objective Lenses (High, Medium,& Low):

Lenses that magnify the image. The _shortest lens_ (4x) is the least powerful and _longest lens_ is the most powerful.

rotates

Arm:

The arm _holds the upper portion _ of the microscope above the stage. One hand should be here when moving microscope

Course Adjustment Knob:

Located on the arm. Allows you to move the upper portion of the microscope up and down.

Fine Adjustment Knob:

Located on the arm. _Small knob_ that allows you to fine tune the image.

Slide & Coverslip:

_Thin piece of glass_ that you place directly over the opening in the stage. Place the material that you want to view on the slide, place a drop of water onto the material & put the coverslip over it.

Stage:

Place the _stuff___ that you want to look at here. It has a hole in the middle to let the light through.

Diaphragm (die-a-fram):

Round disk under the stage that has several _different size holes in it__. It allows you to change the amount of light that comes up through the aperture.

Aperture (app-ur-chure):

The hole in the middle of the stage. Allows light to _come up from the lamp__.

Lamp:

This is located on the base, in the middle. _Reflects light_____ onto the slide so you can see the image.

Base:

This holds the whole microscope up. One hand _goes underneath here_ when holding and moving the microscope.

Legs:

Part of the base. _Sometimes split into two portions_.

Magnification

__Ocular__ or eyepiece is 10x (makes things 10 times bigger).

Objective Lenses include:

Low 4x (makes things 4 times bigger)

_Medium_ 10x (makes things 10 times bigger)

High 40x (makes things 40 times bigger)

The _total magnification_ is found by multiplying the eyepiece and the objective lens power.

When focusing a microscope, always go from _Low_ to _Medium_ to _High_ magnification.

Parts of a Microscope Notes