chapter06 - Chapter 6 Telescopes Portals of Discovery 6.1...

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Unformatted text preview: Chapter 6 Telescopes: Portals of Discovery 6.1 Eyes and Cameras: Everyday Light Sensors • Our goals for learning • How does your eye form an image? • How do we record images? How does your eye form an image? Refraction • Refraction is the bending of light when it passes from one substance into another • Your eye uses refraction to focus light Example: Refraction at Sunset • Sun appears distorted at sunset because of how light bends in Earth’s atmosphere Focusing Light • Refraction can cause parallel light rays to converge to a focus Image Formation • The focal plane is where light from different directions comes into focus • The image behind a single (convex) lens is actually upside-down! How do we record images? Focusing Light • A camera focuses light like an eye and captures the image with a detector • The CCD detectors in digital cameras are similar to those used in modern telescopes Digital cameras detect light with charge-coupled devices (CCDs) What have we learned? • How does your eye form an image? – It uses refraction to bend parallel light rays so that they form an image. – The image is in focus if the focal plane is at the retina. • How do we record images? – Cameras focus light like your eye and record the image with a detector. – The detectors (CCDs) in digital cameras are like those used on modern telescopes 6.2 Telescopes: Giant Eyes • Our goals for learning • What are the two most important properties of a telescope? • What are the two basic designs of telescopes? • What do astronomers do with telescopes? What are the two most important properties of a telescope? 1. Light-collecting area: Telescopes with a larger collecting area can gather a greater amount of light in a shorter time. 2. Angular resolution: Telescopes that are larger are capable of taking images with greater detail. Light Collecting Area • A telescope’s diameter tells us its light- collecting area: Area = π(diameter/2) 2 • The largest telescopes currently in use have a diameter of about 10 meters Bigger is better...
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This note was uploaded on 03/03/2011 for the course RSM 100 taught by Professor Oesch during the Spring '08 term at University of Toronto.

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chapter06 - Chapter 6 Telescopes Portals of Discovery 6.1...

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