topic : microscope aim : how can we measure a cell using a microscope?
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Topic : Microscope Aim : How can we measure a cell using a microscope? Do Now: 1. Take out Density HW ditto 2. Complete the top of yesterday’s notes sheet. HW : Castle Learning due tomorrow!. How do images appear?. Upside down & backwards. On the slide. - PowerPoint PPT PresentationTRANSCRIPT
Topic: Microscope
Aim: How can we measure a cell using a microscope?
Do Now:
1. Copy the aim onto your notes sheet.
2. Complete Microscope Check pink sheet
3. Take out a piece of loose-leaf for today’s notes.
HW: Cells and Cell Processes Exam Review Sheet (BOTH SIDES)
Ruler observed under low power
Ruler observed under high power
LARGER FIELD OF VIEW
SMALLER FIELD OF VIEW
4. Identify what occurs to the field of view when switching from low to high power.•The field of view decreases.•The amount of light decreases.
5. Identify the part that used to focus the slide when using the 4x and 10x objectives.•Coarse adjustment
The diagram represents a cell in the field of view of a compound light microscope.
In which direction should the slide be moved on the microscope stage to center the cell in the field of view?
1. toward A
2. toward B
3. toward C
4. toward D
Cells are so small that even a cluster of these cells from a mouse only measures 50 microns.
The human ovum is typically around between 120 to 150 micrometers which is the largest cell in the human body. It is visible to the human eye under a microscope.
Are there SI units smaller than micro????
"nano-" = 1/1,000,000,000 (billionth)
"pico-" = 1/1,000,000,000,000 (millionth of a millionth, "micro micro-")
Let’s summarize:1. Identify the units used to measure cells.2. Which way do you move the decimal
when converting from mm to um?3. Which way do you move the decimal
when converting from um to mm?4. Describe the two procedures that must be
followed before switching to high power.5. Explain what happens to the amount of
light in your field of view when switching from low to high power.
Determine the length of each cell in um.
Diameter = 1mm Diameter = 2000um
1000um
500um 1000um
500um
= 500um= 500um
Determine the length of each cell in um.
Diameter = 1000um Diameter = 2mm
1000/6= 166.7um
= 2000um
1000um500um