Daily Notes 10/20Daily Notes 10/20

Before ClassBefore Class• What power should you start with when What power should you start with when

looking in a microscope?looking in a microscope?• A) the lowestA) the lowest• B) the highestB) the highest

• Why do you think you start with this Why do you think you start with this one?one?

Daily Notes 10/2Daily Notes 10/2 Draw a Venn Diagram and compare Draw a Venn Diagram and compare

and contrast an animal cell and plant and contrast an animal cell and plant cell (remember both are living, look cell (remember both are living, look at the shape, and parts)at the shape, and parts)

Cell wall

chloroplast

After ClassAfter Class

What do plants cells have that What do plants cells have that animal cells don’t have?animal cells don’t have?

What was highest the total What was highest the total magnification you got to in lab? Was magnification you got to in lab? Was it easy to focus?it easy to focus?

Your PSSA Questions of the WEEKYour PSSA Questions of the WEEK

To find the volume of a few small To find the volume of a few small marbles, a student will need which of marbles, a student will need which of the following scientific tools?the following scientific tools?

    A. A balance and a centimeter rulerA. A balance and a centimeter ruler B. A spring scale and a calculatorB. A spring scale and a calculator C. A graduated cylinder and waterC. A graduated cylinder and water D. A microscope and a micron rulerD. A microscope and a micron ruler

Open to page 7 in your Open to page 7 in your microscope packetsmicroscope packets

Daily NotesDaily Notes What is the objective lens power if What is the objective lens power if

the total magnification isthe total magnification is• 100X _______100X _______• 400X400X _______ _______

What is the area called that is in What is the area called that is in focus when looking through a focus when looking through a microscope?microscope?

Daily NotesDaily Notes QUIZ TOMORROW (HOMEWORK MAKE FLASH QUIZ TOMORROW (HOMEWORK MAKE FLASH

CARDS)CARDS)

A scientist who is conducting a very precise A scientist who is conducting a very precise experiment on the average length of bacteria experiment on the average length of bacteria cells should use the measurement units ofcells should use the measurement units of

    A. millimetersA. millimeters B. centimetersB. centimeters C. micrometersC. micrometers D. kilometersD. kilometers

Open books to Page 9Open books to Page 9

Collins Writing Type 2Collins Writing Type 2 4 lines4 lines

What is a micron? How many What is a micron? How many microns are in a millimeter?microns are in a millimeter?

Goals For TodayGoals For Today

Understand how to measure the field of Understand how to measure the field of viewview

Male flash cards to improve study skillsMale flash cards to improve study skills

Vocab Chapter 2 Vocab Chapter 2

Field of View- The area that you see Field of View- The area that you see in the microscopein the microscope

Magnify- to make something look Magnify- to make something look biggerbigger

Power- the magnification on a lensPower- the magnification on a lens Total magnification- Eyepiece power Total magnification- Eyepiece power

times the objective lens powertimes the objective lens power Focal Plane- The area that is in focusFocal Plane- The area that is in focus

MicroscopesMicroscopes

Of DOOM!Of DOOM!

IntroductionIntroduction

A microscope is a tool used to A microscope is a tool used to magnify the image of small objects.magnify the image of small objects.

There are many types of microscopes There are many types of microscopes ranging from simple light ranging from simple light microscopes to compound microscopes to compound microscopes (like we will use) to microscopes (like we will use) to scanning electron microscopes (that scanning electron microscopes (that cost more than some houses).cost more than some houses).

HistoryHistory

Lenses have been used to magnify Lenses have been used to magnify images for thousands of years. They images for thousands of years. They were sometimes called “burning were sometimes called “burning glasses” because they could also be glasses” because they could also be used to start fires.used to start fires.

History 2History 2

The first compound microscope was The first compound microscope was made around 1590 by two Dutch made around 1590 by two Dutch eyeglass makers – Janssen and eyeglass makers – Janssen and Janssen. A compound microscope Janssen. A compound microscope uses at least two lenses to greatly uses at least two lenses to greatly magnify an image.magnify an image.

History 3History 3

Other famous developers of the Other famous developers of the microscope include:microscope include:

Galileo Galilei (he improved the original and Galileo Galilei (he improved the original and made one that could be focused)made one that could be focused)

Leeuwenhoek (he saw lots of small stuff for Leeuwenhoek (he saw lots of small stuff for the first time like bacteria, yeast, and blood the first time like bacteria, yeast, and blood flowing through capillaries)flowing through capillaries)

Hooke (the first person to see and describe Hooke (the first person to see and describe cells)cells)

Safely Using A MicroscopeSafely Using A Microscope

To carry a microscope put one To carry a microscope put one hand under the base and hand under the base and another hand on the neck.another hand on the neck.• Notice that this means you have Notice that this means you have

NO free hands. Just carry the NO free hands. Just carry the microscope and nothing else.microscope and nothing else.

• If your microscope has a cord be If your microscope has a cord be careful not to trip over it.careful not to trip over it.

• Remember this is a tool and not Remember this is a tool and not a toy!a toy!

Safely Using your Microscope 2Safely Using your Microscope 2

Microscope lenses are delicate and Microscope lenses are delicate and scratch easily.scratch easily.

Water and dust can ruin a Water and dust can ruin a microscope by blocking or distorting microscope by blocking or distorting the image.the image.

Do NOT use you sleeve or a paper Do NOT use you sleeve or a paper towel to wipe off a lens. Instead, use towel to wipe off a lens. Instead, use a piece of lens paper (Mr. Fuddy has a piece of lens paper (Mr. Fuddy has it).it).

Safely Using a Microscope 3Safely Using a Microscope 3

Always begin using your microscope using Always begin using your microscope using the smallest objective lens (4X). This is the smallest objective lens (4X). This is called a scanning or sighting lens.called a scanning or sighting lens.

Once you have found what you are looking Once you have found what you are looking for zoom in by turning to a higher powered for zoom in by turning to a higher powered lens and focusing.lens and focusing.

Always start with your focus low and move Always start with your focus low and move up away from the slide so that you don’t up away from the slide so that you don’t break it!break it!