calculatingmagnificationsizeofspecimensupdated-240819071546-3c61fd4f.pptx

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1. Magnification & Size of Specimens Coordinated Sciences Learning Objective: Be able to calculate magnification & size of specimens

2. Magnification is calculated by: Magnification Image size Actual size = 25mm 10mm Units cancel Mag X2.5

3. Length of ant = 10mm Length of drawing = 25mm Mag = 25mm 10mm Mag X2.5

4. We can use a scale bar to find the actual size of an image

5. First we measure the scale bar 100µm = 20mm 100µm = 20 000µm

6. Next we calculate how much the image has been magnified by seeing how much the scale bar is magnified 100µm = 20mm 100µm = 20 000µm The scale bar is magnified 20 000/100 =X 200

7. What this means is the picture has been magnified 200 times 100µm = 20mm 100µm = 20 000µm The scale bar is magnified 20 000/100 =X 200

8. Next we measure the cell we are interested in 100µm = 20mm 100µm = 20 000µm The scale bar is magnified 20 000/100 =200times The cell is 17mm Or 17 000µm

9. Now we can find the actual length of the cell 100µm = 20mm 100µm = 20 000µm The scale bar is magnified 20 000/100 =200times Mag = image size/ actual size Actual size = image size/mag = 17000µm/200 = 85µm

10. This cell has a diameter of 85µm

11. Can you find the magnification of this cell using the scale bar provided? Then calculate the actual size of the specimens Remember to convert mm to µm