NS206_Ch5 - NS 206 Inside the Milky Way Chapter 5:...

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NS 206 Inside the Milky Way Chapter 5: Telescopes
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Prime purpose of a telescope is to gather light (star light) and bring them to a focus.
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Telescope Design Images can be formed through reflection or refraction Reflecting mirror b Refracting lens
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Reflecting & Refracting Telescopes
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Types of Reflecting Telescopes
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Telescope Size Larger Telescope b Ability to gather more light b Improved image quality Brightness proportional to uare of radius of mirror square of radius of mirror Resolving power: Ability of distinguishing objects that are closer together Resolution is proportional to wavelength and inversely proportional to telescope size
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Effect of Improving resolution (a) 10′; (b) 1′; (c) 5″; (d) 1″
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Resolving Power of Telescopes You can obtain angular resolution in arcsec as Resolution = 0.25 * λ / D where λ is the wavelength of the observed light in μ m D is the diameter of the telescope in m For example, if you are observing yellow light (L yellow = 580 nm = 0.58 μ m) with a telescope of
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This note was uploaded on 01/07/2010 for the course PHYS 206 taught by Professor Ersingögüş during the Spring '09 term at Sabancı University.

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NS206_Ch5 - NS 206 Inside the Milky Way Chapter 5:...

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