Maths for Biology: Magnification

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Presentation transcript:

Maths for Biology: Magnification

Magnification Magnification is how large an image is compared to the object’s real size magnification = Image size Actual size of object The image is what is printed on the page The magnification is given on the image, alongside the scale bar The actual size of the object should be given in µm or nm

The diagram below is a drawing of an organelle from a ciliated cell as seen with an electron microscope. Calculate the actual length of the organelle as shown by the line AB in the diagram. Express your answer to the nearest micrometer (mm). Show your working. Answer = ........................................... mm 102mm 20000 102000mm 20000 = = 5.1

The diagram below is a drawing of an alveolus together with an associated blood capillary. The line AB in the diagram represents an actual distance of 1.5 µm. Calculate the magnification of the drawing. Show your working. Answer = × ................................................. 21mm 1.5mm = 21000mm 1.5mm = 14000

The diagram below shows the general structure of an animal cell as seen under an electron microscope. _________ 5m 24mm 5mm = 24000mm 5mm = = x 4800 1) Calculate the magnification factor of the diagram

The diagram below shows the general structure of an animal cell as seen under an electron microscope. _________ 5m 12mm 4800 = 12000mm 4800 = = 2.5mm 2) Calculate the actual length of structure G

The diagram below shows the general structure of a plant cell when viewed under an electron microscope. ___________ 40m 23mm 40mm = 23000mm 40mm = = x 575 1) Calculate the magnification factor of the diagram