1. Microscope Questions Answer the following questions using your notes and equations you learned yesterday. 1. You are looking at an organism under medium power. It covers 1/4 of the field diameter. What is the actual size of this object? 2. The actual size of a Euglena is 0.075 mm. Your amazing drawing of this critter is 15cm. What is your drawing magnification? 3. The copepod “Cyclops” found in the pond water bucket takes up 50% of the field diameter at low power. What is the actual size of this fresh water crustacean? 4. Lauren drew a 20cm diagram of an ameba and showed it to Evan. He screamed in terror thinking that there were giant blob creatures in the water. Lauren calmed Evan down telling him that the ameba was only.85mm long she just hadn’t calculated her drawing magnification yet. Help Lauren calculate the drawing magnification of her ameba masterpiece.

2. Answers 1.Actual size = field diameter/# that fit across AS = 1.6mm/4 AS = 0.4mm 2. Drawing Magnification = Drawing size/ Actual Size DM = 15cm/.075mm ****(convert to the same units) DM = 150mm/.075mm DM = 2000 x 3. Actual size = field diameter/# that fit across AS = 4mm/2 AS = 2mm 4. Drawing Magnification = Drawing size/ Actual Size DM = 20cm/.85mm *****(convert to the same units) DM = 200mm/.85mm DM = 235 x

3. Microscope Questions 1. You are looking at an organism under high power. You estimate that 3 of these critters could fit across the field diameter. What is the actual size of this creature? 2. The actual size of a volvox is 0.8mm. Your amazing drawing of this critter is 12cm. What is your drawing magnification? 3. The ostracod found in the pond water bucket takes up 1/3 of the field diameter at low power. What is the actual size of this fresh water crustacean? 4. Taylor drew a 15cm diagram of a nematod and showed it to Max. He screamed, started to cry, and wanted to run out of the room. Tayor calmed Max down telling him that the nematod was only 35 mm long she just hadn’t calculated her drawing magnification yet. Help Taylor calculate the drawing magnification of her nematod masterpiece and no Max the worms won’t crawl up your nose and eat your brain.

4. Answers 1.Actual size = field diameter/# that fit across AS = 0.4mm/3 AS = 0.13mm 2. Drawing Magnification = Drawing size/ Actual Size DM = 12cm/.8mm ****(convert to the same units) DM = 120mm/.8mm DM = 150 x 3. Actual size = field diameter/# that fit across AS = 4mm/3 AS = 1.33mm 4. Drawing Magnification = Drawing size/ Actual Size DM = 15cm/35mm *****(convert to the same units) DM = 150mm/35mm DM = 4.3 x