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

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Chapter 6 Telescopes: Portals of Discovery
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6.1 Eyes and Cameras: Everyday Light Sensors Our goals for learning How does your eye form an image? How do we record images?
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How does your eye form an image?
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Refraction Refraction is the bending of light when it passes from one substance into another Your eye uses refraction to focus light
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Example: Refraction at Sunset Sun appears distorted at sunset because of how light bends in Earth’s atmosphere
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Focusing Light Refraction can cause parallel light rays to converge to a focus
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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!
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How do we record images?
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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)
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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
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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?
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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.
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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
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