An important factor in producing a good image with an optical microscope is to obtain a sufficient level of light in the sample or object plane. Not only need to get bright light around the object, but in order to get the best imaging effect, the light should also be uniform throughout the field of view. The best way to illuminate the sample is to use another lens system called a condenser. The front element of the condenser is usually a large flat lens directly below the sample.
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