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L7 - Magnification – simply depends on eye piece-Can...

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10/15/09 Spring Tide – Sun and Moon lined up, experience higher tides (New + Full) Neap Tide – Sun and Moon at right angles cancel each other out lower tides (1 st + 3 rd Quarter) Tides lag behind due to rotation, “pulling” tides with it 3 Reasons to use Telescopes 1) Gathers more light diameter 2 2) Resolves finer detail diameter 3) Magnifies the image eyepiece Light Gathering Power (LGP) – the number of photons (particles of light) you can collect (more photons = brighter) - You can see fainter objects with more LGP - Depends on area of telescope/lens or on diameter 2 Resolution – the smallest angle you can resolve (smaller is better) Θ min = (2.52 x 10 5 λ / D) = 100 / D (arc seconds) where: Θ = minimum angle you can resolve λ = wavelength of light D = diameter (cm) of eye/lens
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Unformatted text preview: Magnification – simply depends on eye piece -Can change it in and out Types of Telescopes 1) Refractor – uses systems of lenses • Advantages – Easy to align and to keep clean (air tight) • Disadvantages – limit on size of lens (too large will deform), tends to be small, and “chromatic aberration” (makes things blurry, however, fairly easy to correct) 2) Reflector – uses mirrors to focus light • Advantages – can support mirror from below, can make arbitrarily large, less prone to imperfections , and no chromatic aberration • Disadvantages – easier to get out of alignment, hard to clean (not air tight), form diffraction patterns/spikes 3) Compound – combination/hybrid of refraction and reflector (has lens and mirror)...
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