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:
“Little Jesus, wast Thou shy
Once, and just so small as I?
And what did it feel like to be
Out of Heaven, and just like me?”
—Francis Thompson (1859–1907)
“Communists have always played an active role in the fight by colonial countries for their freedom, because the short- term objects of Communism would always correspond with the long-term objects of freedom movements.”
—Nelson Mandela (b. 1918)
“And now good morrow to our waking souls,
Which watch not one another out of fear;
For love all love of other sights controls,
And makes one little room an everywhere.
Let sea-discoverers to new worlds have gone,
Let maps to other, worlds on worlds have shown,
Let us possess one world; each hath one, and is one.”
—John Donne (1572–1631)