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Cell Size and Scale

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Cell Size

Use the slider at the Genetic Science Learning Center to view a stunning example of scale.

Some cells are visible to the unaided eye

The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny.

Smaller cells are easily visible under a light microscope. It’s even possible to make out structures within the cell, such as the nucleus, mitochondria and chloroplasts. Light microscopes use a system of lenses to magnify an image. The power of a light microscope is limited by the wavelength of visible light, which is about 500 nm. The most powerful light microscopes can resolve bacteria but not viruses.

By |January 29, 2010|Education|1 Comment

About the Author:

Dr Wiens created the very first chiropractic information page on the web in Nov 1994. In 1995 he joined as chief designer. He lives in Canada.

One Comment

  1. frankp January 29, 2010 at 7:08 pm

    Thanks John. Zooming in with the slider gave me a Lilliput rush as I zeroed in on the Carbon atom. Way kewl!

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