The actual size of the organism will be 5 µm.
Microscope magnification
The organism occupies 1/4 of the field diameter.
The field diameter is 2000 µm. So, the organism occupies 1/4 x 2000 = 500 µm.
The total magnification under the low power objective is 100.
100x = 500, x = 500/100 = 5 µm
More on microscope magnification can be found here: https://brainly.com/question/14668612
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