Daily Notes 10/20  Before Class What power should you start with when looking in a microscope?What power should you start with when looking in a microscope?

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Presentation transcript:

Daily Notes 10/20  Before Class What power should you start with when looking in a microscope?What power should you start with when looking in a microscope? A) the lowestA) the lowest B) the highestB) the highest Why do you think you start with this one?Why do you think you start with this one?

Daily Notes 10/2  Draw a Venn Diagram and compare and contrast an animal cell and plant cell (remember both are living, look at the shape, and parts) Cell wall chloroplast

After Class  What do plants cells have that animal cells don’t have?  What was highest the total magnification you got to in lab? Was it easy to focus?

Your PSSA Questions of the WEEK

 To find the volume of a few small marbles, a student will need which of the following scientific tools?  To find the volume of a few small marbles, a student will need which of the following scientific tools?  A. A balance and a centimeter ruler  B. A spring scale and a calculator  C. A graduated cylinder and water  D. A microscope and a micron ruler

Open to page 7 in your microscope packets

Daily Notes  What is the objective lens power if the total magnification is 100X _______100X _______ 400X _______400X _______  What is the area called that is in focus when looking through a microscope?

Daily Notes  QUIZ TOMORROW (HOMEWORK MAKE FLASH CARDS)  A scientist who is conducting a very precise experiment on the average length of bacteria cells should use the measurement units of  A scientist who is conducting a very precise experiment on the average length of bacteria cells should use the measurement units of  A. millimeters  B. centimeters  C. micrometers  D. kilometers

Open books to Page 9 Collins Writing Type 2  4 lines  What is a micron? How many microns are in a millimeter?

Goals For Today  Understand how to measure the field of view  Male flash cards to improve study skills

Vocab Chapter 2  Field of View- The area that you see in the microscope  Magnify- to make something look bigger  Power- the magnification on a lens  Total magnification- Eyepiece power times the objective lens power  Focal Plane- The area that is in focus

Microscopes Of DOOM!

Introduction  A microscope is a tool used to magnify the image of small objects.  There are many types of microscopes ranging from simple light microscopes to compound microscopes (like we will use) to scanning electron microscopes (that cost more than some houses).

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

History 2  The first compound microscope was made around 1590 by two Dutch eyeglass makers – Janssen and Janssen. A compound microscope uses at least two lenses to greatly magnify an image.

History 3  Other famous developers of the microscope include:  Galileo Galilei (he improved the original and made one that could be focused)  Leeuwenhoek (he saw lots of small stuff for the first time like bacteria, yeast, and blood flowing through capillaries)  Hooke (the first person to see and describe cells)

Safely Using A Microscope  To carry a microscope put one hand under the base and another hand on the neck. Notice that this means you have NO free hands. Just carry the microscope and nothing else.Notice that this means you have NO free hands. Just carry the microscope and nothing else. If your microscope has a cord be careful not to trip over it.If your microscope has a cord be careful not to trip over it. Remember this is a tool and not a toy!Remember this is a tool and not a toy!

Safely Using your Microscope 2  Microscope lenses are delicate and scratch easily.  Water and dust can ruin a microscope by blocking or distorting the image.  Do NOT use you sleeve or a paper towel to wipe off a lens. Instead, use a piece of lens paper (Mr. Fuddy has it).

Safely Using a Microscope 3  Always begin using your microscope using the smallest objective lens (4X). This is called a scanning or sighting lens.  Once you have found what you are looking for zoom in by turning to a higher powered lens and focusing.  Always start with your focus low and move up away from the slide so that you don’t break it!