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optical 1. of, relating to, producing, or involving light 2. of or relating to the eye or to the sense of sight; optic 3. (esp of a lens) aiding vision or correcting a visual disorder optical [′äp·tə·kəl] (optics) Pertaining to or utilizing visible or near-visible light; the extreme limits of the optical spectrum are about 100 nanometers (0.1 micrometer or 3 × 1015hertz) in the far ultraviolet and 30,000 nanometers (30 micrometers or 1013hertz) in the far infrared. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| This young soldier knew the optical illusions produced by tears. On the whole tour, particularly at the Descent, we undergo an optical illusion which often seems to be incredible. The entire ship's crew were undergoing a nervous excitement, of which I can give no idea: they could not eat, they could not sleep--twenty times a day, a misconception or an optical illusion of some sailor seated on the taffrail, would cause dreadful perspirations, and these emotions, twenty times repeated, kept us in a state of excitement so violent that a reaction was unavoidable. |
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