Topic: Measure Focal Lengths of Lenses
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How to Measure the Focal Length of a Mirror at Home
When light rays fall parallel on a mirror, they converge to a point called the focal point. Focal length measures the distance between center of the mirror to the focal point. The type of mirror determines where the image will be formed. Kn... Read More »
Source: http://www.ehow.com/how_6874178_measure-focal-length-mirror-home....
How to determine the focal length of group of lenses?
Measure the distance from the center of the lens to the area where it 1.)Produces a clear image of very distant objects, 2.) The Sun (Be careful!), 3.) The Moon, 4.) A bright star or planet. The source needs to be at or near infinity. If yo... Read More »
Source: http://wiki.answers.com/Q/How_to_determine_the_focal_length_of_gr...
What units are Lens focal lengths are measured in?
Focal length is measured in milimeters (mm) ----------------------------------------------------------------- Read More »
Source: http://wiki.answers.com/Q/What_units_are_Lens_focal_lengths_are_m...
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Measure Focal Lengths of Lenses
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focal length is measured in mm
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Source: http://wiki.answers.com/Q/How_do_you_measure_focal_length
No, a 200mm lens does not "zoom". It is a "fixed focal length" or "single focal length" lens. The single focal length lens is commonly called a "prime" lens. Its performance is better than a zoom lens due to fewer compromises in its design ...
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Source: http://answers.yahoo.com/question/index?qid=20080307192545AAYfQ4s
Focal length refers to the distance from a point within a lens to the film plane when the lens is focused on infinity. For a 50mm lens, this point (rear nodal point) is 50mm away from the film plane if the lens is focused on infinity. An im...
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Source: http://wiki.answers.com/Q/How_do_you_measure_focal_length_on_view...
The focal length is defined as the distance from the optical center of a lens to the focal point. The length remains the same.
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Source: http://www.chacha.com/question/how-do-you-measure-the-focal-lengt...
The focal length of a concave lens is negative because it is a virtual focal point rather than a real one.
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Source: http://www.chacha.com/question/what-kind-of-focal-length-do-conca...
The focal length is the place where parallel light is brought to focus. So to find the focal length just focus a distant object on a piece of paper. The distance of that image from the lens will approximate the focal length. The more distan...
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Source: http://answers.yahoo.com/question/index?qid=20090628121542AA5IENq
