.01mm stage micrometer
stage micrometer = 1 divisions to 7 divisions on the ocular micrometer
Step 1: [(1)(.01)/(7)]
Step 2: (.01/7)(1000)
Step 3: (.0014)(1000)
Equals: 1.4µm per ocular division
You have calibrated your ocular micrometer. Each division of the ocular micrometer equals 1.4µm. You count 5 divisions of the ocular micrometer as the length of an individual specimen. How long is this specimen?
Formula: Total specimen length (x) = (length of one division of the ocular micrometer)(number divisions counted as length of an individual specimen).
Step 1: x = (1.4µm)(5 divisions)
Step 2: x = 7µm
Note: In unknowns, if your organism is 7µm in length, does that length fall within the known lengths for the species you think you have?