• Question: how big is the naked eye

    Asked by NelsNels to Aimee on 15 Nov 2015.
    • Photo: Aimee Goodall

      Aimee Goodall answered on 15 Nov 2015:

      The size of a human eye is roughly 2.5cm across!
      The biggest the naked eye can see are objects 0.04mm wide, like a hair.
      We can’t see objects which are 0.02mm across though, they are just too small!
      Look on a ruler so see how big a mm is, its 1/10th of a cm!

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