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LIGHT: African violets are grown indoors. They like bright, but filtered, sunlight. Do not place in direct sun. They can also be grown under florescent lights. The lights are usually suspended 12 to 18 inches above the violet for 8 to 14 hours a day.
How does a fluorescence microscope work? In the picture above, we are supposing the excitation light needs to be violet, and the emitted light is red. The microscope uses a special dichroic mirror (or more properly, a dichromatic mirror, although this term only seems to be used by purists).