Introduction To Microscopes History & Parts

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Information about Introduction To Microscopes History & Parts

Published on October 2, 2007

Author: MissWander

Source: slideshare.net

Description

Introduction to Microscopes (History, Function & Parts) PowerPoint

Introduction to Microscopes! Now Seeing IS Believing!

A Brief History

Simple Glass Magnifiers More than 500 years ago. In 1600s, this “simple microscope” allowed scientists to see cells and bacteria Problem: not enough magnification

More than 500 years ago.

In 1600s, this “simple microscope” allowed scientists to see cells and bacteria

Problem: not enough magnification

First Compound Microscope Developed at the beginning of the 1600's, by the Janssen brothers and Galileo Problem: images were blurred and had colored halos

Developed at the beginning of the 1600's, by the Janssen brothers and Galileo

Problem: images were blurred and had colored halos

Simple Compound Microscope Invented in 1660s Problem: all images had red or blue “halos” around them

Invented in 1660s

Problem: all images had red or blue “halos” around them

Even better! 1700 and 1800s – great improvement in microscopes Usually made of brass (expensive) Had a tripod for support

1700 and 1800s – great improvement in microscopes

Usually made of brass (expensive)

Had a tripod for support

Modern Compound Microscope 1900s, started using iron instead of brass (cheaper) Only one eyepiece (monocular) Outside light source reflected onto mirror Very functional Still used today

1900s, started using iron instead of brass (cheaper)

Only one eyepiece (monocular)

Outside light source reflected onto mirror

Very functional

Still used today

Fancy! Better images More magnification Better lighting Easier to use Now everyone, at one time or another, has looked through a microscope

Better images

More magnification

Better lighting

Easier to use

Now everyone, at one time or another, has looked through a microscope

How Does It Work? A microscope works very much like a telescope. A telescope must gather light from a dim, far away object. So, it needs a large objective lens to gather as much light as possible and a long body to bring the image into focus.

A microscope works very much like a telescope.

A telescope must gather light from a dim, far away object.

So, it needs a large objective lens to gather as much light as possible and a long body to bring the image into focus.

How Does It Work? Unlike a telescope, a microscope must gather light from a tiny specimen that is close-by . So the microscope does not need a large objective lens. Instead, the objective lens of a microscope is small . Then the image is again magnified by a second lens, called an eyepiece , as it is brought to your eye.

Unlike a telescope, a microscope must gather light from a tiny specimen that is close-by .

So the microscope does not need a large objective lens.

Instead, the objective lens of a microscope is small .

Then the image is again magnified by a second lens, called an eyepiece , as it is brought to your eye.

Parts of a Compound Microscope So EASY a KID could use it!

Base The bottom of the microscope, used for support Hold this part with one hand when carrying a microscope ←

The bottom of the microscope, used for support

Hold this part with one hand when carrying a microscope

Mirror Reflects the light so the specimen is easier to see ←

Reflects the light so the specimen is easier to see

Stage The flat platform where you place your slides.  It has a hole in it so light can shine through ←

The flat platform where you place your slides. 

It has a hole in it so light can shine through

Clip Shiny clips on the top of the stage Holds a slide in place ←

Shiny clips on the top of the stage

Holds a slide in place

Arm Supports the tube and connects it to the base The part you hold when you carry the microscope ←

Supports the tube and connects it to the base

The part you hold when you carry the microscope

Coarse Adjustment Large, round knob on the side of the microscope Either moves the stage or the top part of the microscope up and down ->

Large, round knob on the side of the microscope

Either moves the stage or the top part of the microscope up and down

Fine Adjustment Small, round knob on the side of the microscope Used to fine tune the focus after using the coarse adjustment knob. ->

Small, round knob on the side of the microscope

Used to fine tune the focus after using the coarse adjustment knob.

Eyepiece The lens at the top that you look through. 10X power ->

The lens at the top that you look through.

10X power

Body Tube The long tube that holds the eyepiece and connects the objective ->

The long tube that holds the eyepiece and connects the objective

Nosepiece Rotating part of the microscope at the bottom of the body tube. It holds the objective lenses ←

Rotating part of the microscope at the bottom of the body tube.

It holds the objective lenses

High Power Objective The longest objective lens The highest magnification 40X lens (40X x 10X = 400X magnification) ->

The longest objective lens

The highest magnification

40X lens (40X x 10X = 400X magnification)

Low Power Objective The shortest objective lens The lowest magnification 4X lens (4X x 10X = 40X magnification) ←

The shortest objective lens

The lowest magnification

4X lens (4X x 10X = 40X magnification)

Mid Power Objective The medium length objective lens The medium magnification 10X lens (10X x 10X = 100X magnification) ←

The medium length objective lens

The medium magnification

10X lens (10X x 10X = 100X magnification)

Diaphragm Controls the amount of light going through the hole in the stage ->

Controls the amount of light going through the hole in the stage

Pop Quiz What two parts should you hold when you carry a microscope? Base & Arm Where do you put a slide? On the Stage To focus, what knob do you turn first? Second? First, Coarse Adjustment Second, Fine Adjustment ← ← -> ← ←

What two parts should you hold when you carry a microscope?

Base & Arm

Where do you put a slide?

On the Stage

To focus, what knob do you turn first? Second?

First, Coarse Adjustment

Second, Fine Adjustment

Test Your Skills . . . Arm Body Tube Stage Clip Base Coarse Adjustment Fine Adjustment

Arm

Body Tube

Stage

Clip

Base

Coarse Adjustment

Fine Adjustment

Test Your Skills High Power Objective Low Power Objective Mirror Eyepiece Nosepiece Diaphragm

High Power Objective

Low Power Objective

Mirror

Eyepiece

Nosepiece

Diaphragm

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