CH4 - 1 Chapter Four Telescopes 1-Type of telescopes Make a...

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Chapter Four Telescopes. 1-Type of telescopes. Make a sketch of a reflector and a refractor. Comparing the two types of optical telescopes: Refractor Reflectors Cannot be large Support at edges Two surface to polish Lenses are heavy and bulky Can be large Support from behind Only one surface to polish Mirrors are thinner and lighter Absorption of light in glass, mainly IR and UV Light is reflected on surface. Minimum absorption. Types of reflectors. 2. Newtonian 3. Cassegrain What type of telescope is illustrated below? Give the names of the parts indicated with the letters. Give the name of a few examples of large reflectors. Where are the two Keck twin telescopes located? What type of mirror do they have? Powers of the telescopes. a- Light gathering power. This property determines the amount of light that goes into the telescope. It is proportional to the surface of the primary or to the (diameter) 2 or (radius) 2 . The surface of the primary is also refer as the aperture of the telescope. b-
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This note was uploaded on 10/17/2011 for the course AST 2002 taught by Professor Staff during the Spring '08 term at FAU.

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CH4 - 1 Chapter Four Telescopes 1-Type of telescopes Make a...

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