The length of a nucleus is 3.2epu. At x100 magnification, how long is the actual nucleus? If we zoomed in to x400 magnification, the length of the nucleus is now 13epu. What is it's actual length?
At x100 magnification 1epu=10μm, so the actual length is 3.2x10=32μm. At x400 magnification 1epu=2.5μm, so the actual length is 13x2.5=32.5μm.
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