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What is the value of a green filter placed in the light path?

April 26, 2017filter light path Placed value

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What is the value of a green filter placed in the light path?

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Because achromats and planachromats are best corrected spherically for green light, and since the use of monochromatic light eliminates chromatic aberration, the performance of achromats is markedly improved with the use of a green filter. Also, phase contrast objectives are computed to give best phase images in green light.