Magnification • Calculate true size, image size, and magnification • Make unit conversions
Units Unit How many millimeters Millimeter (mm) 1 mm Micrometer (μm) 0. 001 mm Nanometer (nm) 0. 000001 mm
Conversions mm into μm (x 1000) μm into nm (x 1000) 32. 5 mm is how many μm? 32 500
Calculations… Write the equations for each Size of image (I) True size (T) Magnification (M)
Figure 5. 1 Paramecium caudatum Find the true size (T) x 600
Figure 5. 1 Paramecium caudatum Measured length = 142 mm x 600
Figure 5. 2 x 9000 chloroplasts
Figure 5. 2 chloroplasts Mean measured length of the four largest chloroplasts = 39. 25 mm x 9000
Figure 5. 3 a bacterium (actual size = 0. 002 mm) Calculate the magnification (M) Measured length = 128 mm
Figure 5. 4 seven week human embryo
Figure 5. 4 seven week human embryo If you have a scale bar… Measure the actual length of the scale bar (25 mm) and divide by the length it represents Magnification = 25 ÷ 10 = x 2. 5
Figure 5. 5 head of a fruit fly
Figure 5. 5 head of a fruit fly A length of the scale bar - 12. 5 mm
Figure 5. 6 pollen grain
Figure 5. 6 pollen grain (a) A length of the scale bar – 25 mm Magnification = (b) Image size = 47 mm. What is the true size?
Figure 5. 7 red blood cells in an arteriole
Figure 5. 7 red blood cells in an arteriole Measured length of scale bar = 30 mm Magnification = Image size (diameter of RBC) = 25 mm Actual diameter =
Figure 5. 8 a mitochondrion
Figure 5. 8 a mitochondrion Measured length of scale bar = 30 mm Magnification = Measured width = 34 mm Actual width =