Naked Eye - Small Objects and Maps

Small Objects and Maps

Observing a nearby small object without a magnifying glass or a microscope, the optimal distance is 20–25 cm. At this close range, 0.05 mm can be seen clearly. The accuracy of a measurement ranges from 0.1 to 0.3 mm and depends on the experience of the observer. The latter figure is the usual positional accuracy of faint details in maps and technical plans.

Read more about this topic:  Naked Eye

Famous quotes containing the words small, objects and/or maps:

    Do but consider this small dust, here running in the glass,
    By atoms moved.
    Could you believe that this the body was
    Of one that loved?
    And in his mistress’ flame playing like a fly,
    Turned to cinders by her eye?
    Yes, and in death as life unblest,
    To have’t expressed,
    Even ashes of lovers find no rest.
    Ben Jonson (1572–1637)

    I do not know that I meet, in any of my Walks, Objects which move both my Spleen and Laughter so effectually, as those Young Fellows ... who rise early for no other Purpose but to publish their Laziness.
    Richard Steele (1672–1729)

    And at least you know

    That maps are of time, not place, so far as the army
    Happens to be concerned—the reason being,
    Is one which need not delay us.
    Henry Reed (1914–1986)