| focal point |
The point of interest or the object of your attention or the point at which a lens focuses a beam of light. This is usually directly behind a lens sheet.
출처: www.mirageworks.net/mw/terminology.html
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| focal length |
This is the length of the light path, from the objective to the focal plane. The magnification is the focal length of the telescope divided by the focal length of the eyepiece. See also focal ratio.
출처: www.astronexus.com/saafaq/glossary.php
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| focal length |
The optical property of a lens. In projection terms, the smaller the focal length, the larger the projected image is likely to be.
출처: www.qeiicc.co.uk/organising_an_event/av/glossary
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| focal length |
The distance of the light path from the objective (primary lens or mirror) to the convergence of the beam. The convergent spot is called the Focus or Focal Point.
출처: www.opticalvision.co.uk/content.asp
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| focal plane |
The plane that the telescope (or eyepiece) focuses on. When you turn the focus knob on the telescope, you are moving the eyepiece back and forth until you make the two focal planes coincide.
출처: www.astronexus.com/saafaq/glossary.php
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