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The diameter of the lower power field is 2.0 millimeters; a cell that is half the field's diameter has a diameter of 1.0 millimeters. How many microns is that diameter?

2,000 microns

1,000 microns

Converting between metric units is the key idea here: 1 millimeter equals 1000 micrometers. The cell’s diameter is 1.0 millimeters, so in micrometers it’s 1.0 × 1000 = 1000 micrometers. Therefore, the diameter is 1000 microns.

750 microns

500 microns

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