section 7.1 summary – pages 171-174 the microscope was invented in the late 1500s by dutch...

• The microscope was invented in the late 1500s by Dutch spectacle-maker Zacharias Janssen.

HISTORY

• It magnified objects 3 to 9 times its size.

• The first person to observe single-celled organisms under a microscope was Anton van Leeuwenhoek

(Lay-vun-hook).

• His was a simple light microscope because it contained one lens and used natural light to view

objects.

HISTORY

• Robert Hooke was an English scientist who lived at the same time as van Leeuwenhoek. He named “cells” and described them as the basic unit of life.

• Hooke used a compound light microscope to study cork, the dead cells of oak bark.

HISTORY

COMPOUND LIGHT MICROSCOPE

Compound light microscopes use light to view and a series of lenses to magnify objects in steps.

Compound Light Microscope

• Compound- because it uses more than one lens

• Light- because it uses light to transmit the image to your eye

• Microscope- “micro” means small

“scope” means view

Compound Light Microscope

• Modern compound light microscopes can magnify an object up to 2000Xs its size.

Elodea Elodea Elodea

40 x 100x 400x

Electron MicroscopeCOST: BETWEEN $250,000 AND $2,000,000

• The electron microscope was first invented in the 1940s.

• This microscope uses a beam of

electrons to illuminate and then create an

image that magnifies

structures up to 500,000 times

their actual size.

MICROSCOPES

DUST MITE

Parts of the microscope

Where you look in, it has

a 10X lens

Parts of the microscope

Magnify the object even

more by different amounts

Helps zoom in and out

fast

Helps zoom in and out

very carefully

Parts of the microscope

Allows light to shine through

the slide

Where you put your slide

Turn to allow more or less light through

TAPE YOUR LABELED MICROSCOPE IN YOUR LAB BOOK

MAKE A TABLE OF CONTENTS ENTRY.

Make sure you put your comp. book in the cabinet for me to grade.