This tutorial explores the optical pathways in a transmitted light microscope. Instructions and a discussion about how to operate this tutorial appear immediately below the window.

	Interactive Java Tutorial
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To operate the tutorial, use the slider bars beneath the microscope to control the aperture of the field diaphragm (left slider), the aperture (condenser) diaphragm (middle slider), and the illumination intensity (right slider). The button controls whether the internal ("inside") or external ("outside") view of the microscope is selected.