202 Lecture 6

202 Lecture 6 - Telescopes Functions of telescopes (Photon...

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Telescopes Functions of telescopes (Photon Buckets): Collect the largest flux of photons (light) possible: Light-gathering power Increases with size of primary mirror or primary lens. Collect the largest amount of photons possible: Photography and CCD Resolve the light sources: Superposition, Interference. Increases with size of primary mirror or primary lens. Observe the whole range of the electromagnetic spectrum: Radio telescopes, Space telescopes Types of Telescopes: Reflecting Telescopes use a mirror to gather and collect light, and a small lense (eyepiece) to allow observation with the eye. Refracting Telescopes use a lens to gather and collect light and a second, small lens (eyepiece) to allow observation with eye. Reflection of Light: Light rays approaching the surface of a mirror will bounce off at the same angle with the perpendicular to the mirror surface, but on the opposite side (principle of reflection). The angle is the same for all the wavelengths (colors) of light. Reflecting telescopes:
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This note was uploaded on 12/09/2009 for the course CS 431,430,48 taught by Professor Scher,statica during the Spring '09 term at NJIT.

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202 Lecture 6 - Telescopes Functions of telescopes (Photon...

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