A student using a compound microscope with a 10X ocular lens and a 4X objective lens measured his field of view with a plastic ruler and found it to be 4 mm. He then placed some of his cheek cells on a slide, found them using the 4X objective lens and switched to the 40X objective lens. He counted twelve cells, side by side, that stretched from one side of the field of view to the other. What is the best estimate for the diameter of a cheek cell?

Question:A student using a compound microscope with a 10X ocular lens and a 4X objective lens measured his field of view with a plastic ruler and found it to be 4 mm. He then placed some of his cheek cells on a slide, found them using the 4X objective lens and switched to the 40X objective lens. He counted twelve cells, side by side, that stretched from one side of the field of view to the other. What is the best estimate for the diameter of a cheek cell?

1.0.033 mm

2.0.132 mm

3.0.0132 mm

4.0.0033 mm


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