The actual diameter of the cell would be 0.1 mm.
We are given that, the magnification due to the ocular lens is 10x and the magnification due to the objective lens is 40x.
Therefore, the total magnification of the whole setup will be 400x.
This means that an object with a diameter of x m will have a magnified diameter of 400x.
In the above situation, the magnified cell has a diameter of 40 mm.
When the actual diameter is x, the magnified diameter is 400x.
Hence 400x = 40 mm
x = 40 mm/400
x = 0.1 mm
Hence, the actual diameter of the cell would be 0.1 mm.
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