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