Place the ruler on the stage of microscope, focus on it using the adjustment knob and observe the diameter of the circular field of view through the eyepiece and measure it in mm.

Question

TextDiscovery of Cell by Robert Hooke

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Living cells were discovered by

Take a transparent ruler with millimetre (mm) markings.

Convert the diameter from mm to micrometre (µm). Suppose the diameter of the visible field is 5 mm, meaning 5 × 1000 = 5000 µm.