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NATS 1311 - From the Cosmos to Earth. . Geometry of a Concave Mirror. Vertex. . . . Focal length. Focal plane. NATS 1311 - From the Cosmos to Earth. Types of Reflecting Telescopes. Each design incorporates a small mirror just in front of the prime focus to reflect the light to a convenient location for viewing..
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7. NATS 1311 - From the Cosmos to Earth Refracting/Reflecting Telescopes
8. NATS 1311 - From the Cosmos to Earth Secondary Optics
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14. NATS 1311 - From the Cosmos to Earth Two Fundamental Properties of a Telescope Resolution
smallest angle which can be seen
? = 1.22 ? / D
The angular resolution of a reflecting telescope is dependent on the diameter of the mirror (D) and the wavelength of the light being viewed (?)
Light-Collecting Area
think of the telescope as a photon bucket
The amount of light that can be collected is dependent on the mirror area A = ? (D/2)2
These properties are much more important than magnification which is produced by placing another lens - the eyepiece - at the mirror focus. Astronomers do not look through telescopes with their eyes - a light gathering detector (for instance a camera) records the image which can later on be magnified to any desired size.
15. NATS 1311 - From the Cosmos to Earth Angular Resolution
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18. NATS 1311 - From the Cosmos to Earth Light Gathering Ability: Size Does Matter
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20. NATS 1311 - From the Cosmos to Earth Magnifying Power
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