Transcript Chapter 3 section 1 notes

Scientific
Measurement
Bell Ringer

What are the two different types of
microscopes?
What are these?
Conversions
K
HDbd cm
Group Challenge

7m = _____ Kilometers

2.3L = _____ milliliters

1750g = _____Kilograms

250cm = _____ Meters
History of the Microscope
Invented between 1590-1600
 Robert Hooke-1665 viewed cells for the
first time
 Anton van Leewenhoek- first to describe
bacteria

Microscopes

Light Microscope – light passes through
one or more lenses to produce an
enlarged image of a specimen.
Light Microscope

Use two lenses

A light bulb in the base shines light up
through the specimen mounted on a glass
slide. The objective lens then collects the
light, which then travels to the eye.
Microscopes

Electron Microscope – forms an image of a
specimen using a beam of electrons rather than
light.

Can magnify up to 200,000x

Living things can’t be seen under an Electron
microscope because the specimens have to be
looked at while in a vacuum.
Electron Microscope
Microscopes

Magnification – is the quality of making an
image appear larger than its actual size.

Resolution – Is a measure of the clarity of
an image.