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The focal length of an optical system is a measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus. -- Wikipedia

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Hyperfocal Distance and Depth of Field Calculator - DOFMaster LE

Depth of field and hyperfocal distance calculator for Palm OS devices. Quick and easy: three taps to set focal length, aperture, and focus distance.
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Bi-Concave Lenses Silicon Optical Lenses丨CLZ Optical

Similar to the Plano-Concave Lenses, the Bi-Concave Lenseshave negative focal lengths, thereby causing collimated incident light to diverge. This Spherical Lenses lenses have equal radius of curvature on both side of the
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Safari complete guide • Important tips and advice | Wild Encounter Saf

Want to know what to pack for African safari? ★ Need some information about safari preparation? → Check out our guide!
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Soleprice: Online Shopping for Electronic Gadgets, Home Products, Toys

Online Shopping at Soleprice for the best electronic gadgets, led controller,led dimmer, gifts, sporting goods, home products and apparel for geeks at unbeatable great prices.
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Soleprice: Online Shopping for Electronic Gadgets, Home Products, Toys

Online Shopping at Soleprice for the best electronic gadgets, led controller,led dimmer, gifts, sporting goods, home products and apparel for geeks at unbeatable great prices.
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Optics manufacturer|optical systems and optoelectronics|Goggles| Buy-

Manufacturer Optics, Physics Labware, Compact Light Source For Physics Lab, Diffraction Gratings For Physics Lab, Lens Cylindrical Double For Physics Lab, Lens Cylindrical Plano Concave For Physics Lab, Lens Cylindrical
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William Herschel - Wikipedia

Wilhelm, nineteen years old at this time, was a quick student of the English language. In England, he went by the English rendition of his name, Frederick William Herschel.
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Spherical Lenses-CLZ

Spherical lenses, featuring curved surfaces, alter light's path and wavefront curvature. They find extensive applications in medical imaging, lasers, security, automotive, military, aerospace, and high-tech industries.
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