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Date: 20-3-2016
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RESOLVING POWER
The resolution, also called resolving power, is the ability of a telescope to separate two objects that are not in exactly the same place in the sky. It is measured in an angular sense, usually in seconds of arc (units of 1⁄3600 of a degree). The smaller the number, the better is the resolving power.
The best way to measure a telescope’s resolving power is to scan the sky for known pairs of stars that are appear close to each other in the angular sense. Astronomical data charts can determine which pairs of stars to use for this purpose. Another method is to examine the Moon and use a detailed map of the lunar surface to ascertain how much detail the telescope can render.
Resolving power increases with magnification, but only up to a certain point. The greatest image resolution a telescope can provide is directly proportional to the diameter of the objective lens or mirror, up to a certain maximum dictated by atmospheric turbulence. In addition, the resolving power depends on the acuity of the observer’s eyesight (if direct viewing is contemplated) or the coarseness of the grain of the photographic or detecting surface (if an analog or digital camera is used).
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اكتشاف تأثير صحي مزدوج لتلوث الهواء على البالغين في منتصف العمر
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زهور برية شائعة لتر ميم الأعصاب التالفة
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جامعة الكفيل تنظم مجلس عزاء بذكرى شهادة الإمام جعفر الصادق (عليه السلام)
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الأمانة العامة للعتبة الكاظمية المقدسة .. تُجري قرعة الحج ضمن حصتها المقرّرة لخدّام الإمامين الكاظمين "عليهما السلام"
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مواكب كربلاء الشهادة توافدت إلى أرض الكاظمين لتعزي بشهادة صادق الأئمة "عليه السلام"
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مواكب مدينة القاسم "عليه السلام" تُفصح عن مشاعرها وولاءها وهي تحيي شهادة الإمام الصادق "عليه السلام"
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