Section 7.1 Summary – pages 171-174 HISTORY The microscope was invented in the late 1500s by Dutch spectacle-maker Zacharias Janssen. It magnified objects 3 to 9 times its size. Section 7.1 Summary – pages 171-174

Section 7.1 Summary – pages 171-174 HISTORY 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. Section 7.1 Summary – pages 171-174

Section 7.1 Summary – pages 171-174 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. Section 7.1 Summary – pages 171-174

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 40 x 100x 400x

Electron Microscope COST: BETWEEN $250,000 AND $2,000,000

Section 7.1 Summary – pages 171-174 MICROSCOPES 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. DUST MITE Section 7.1 Summary – pages 171-174

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.