CHAPTER 6 ASTRO.docx

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Department
Astronomy & Astrophysics
Course
AST201H1
Professor
Michael Reid
Semester
Winter

Description
CHAPTER 6 TELESCOPES 61Refraction is the bending of a waveNowadays most images are recorded digitally with electronic detectors called charge coupled devices CCDs A CCD is a chip of silicon is chip that is extremely sensitive to photons Its physically divided into a grid of squares called picture elements pixelsAdvantages of CCDs over photographic film much more sensitive to light have a much wider dynamic range which allows it to record dim and bright light at the same time can be digitally processed to bring out the details of the image 622 most important properties of a telescope light collecting area and angular resolutiona 10m telescope has a light collecting area 25 times greater than a 2m telescope 102225angular resolution is the SMALLEST angle over which we can tell two dots or two stars are distinct Human angular resolution is 160 degreesHubble space telescope 24m has a angular
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