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![Focus (optics) - Wikipedia, the free encyclopedia](https://www.iarticlesnet.com/pub/img/site/s_50.jpeg)
Focus (optics) - Wikipedia, the free encyclopedia
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日期:2024-07-10
Since light can pass through a lens in either direction, a lens has two focal points
—one on each side. The distance in air from the lens or mirror's principal plane ......看更多