Dutch inventions dating 17th century


23-Mar-2016 22:17

The theoretical minimum size able to be viewed by an optical microscope is 200nm (as defined by Abbe), since optical microscopes are only able focus on objects that are at least the size of a wavelength of light (usually, a wavelength of around 550 nm is assumed).

An electron microscope, in contrast, can magnify images thousands of times smaller than a wavelength of light.

Compound microscopes feature two or more lenses, connected by a hollow cylinder (tube).

The top lens, the one people look through, is called the eyepiece. So today, when we say "microscope," we really mean "compound microscope".

He looked at all sorts of things (snow, a needle, a razor, etc.) with a primitive compound microscope, but his most significant observations were done on fleas and cork.

He observed the fleas under the microscope and was able to observe the tiny hairs on the fleas' bodies. Upon examination of the pores, he decided to call them "cells"; however, he did not know he had just discovered plant cells.

There is a lens called "the objective" which produces a primary magnified image.

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The object near the end of the tube appeared to be greatly enlarged, much larger than any simple magnifying glass could achieve by itself.

Their first microscopes were more of a novelty than a scientific tool since maximum magnification was only around 9x and the images were somewhat blurry.