INGIN awet muda dan menjaga tubuh tetap berenergi? Konsumsilah buah anggur karena sumber energi instan ini mampu menjaga penampilan terlihat lebih muda.
Saturday, July 30, 2011
Wednesday, July 20, 2011
Microscope
Historians credit the invention of the compound microscope to the Dutch spectacle maker, Zacharias Janssen, around the year 1590. The compound microscope uses lenses and light to enlarge the image and is also called an optical or light microscope (vs./ an electron microscope). The simplest optical microscope is the magnifying glass and is good to about ten times (10X) magnification. The compound microscope has two systems of lenses for greater magnification,
1) the ocular, or eyepiece lens that one looks into and
2) the objective lens, or the lens closest to the object.
Before purchasing or using a microscope, it is important to know the functions of each part.
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