telescopes collect more light than eye more detailed images than human eye larger aperture is better...
Post on 22-Dec-2015
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![Page 1: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/1.jpg)
Telescopes
• Collect more light than eye
• More detailed images than human eye
• Larger aperture is better– Aperture refers to the diameter of the primary
lens or mirror of telescope
• Magnification is useless without:sensitivity and resolution are crucial
![Page 2: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/2.jpg)
Refractor Telescope
![Page 3: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/3.jpg)
Reflector Telescope
![Page 4: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/4.jpg)
Reflectors
![Page 5: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/5.jpg)
Sensitivity
Compound Mirror:
![Page 6: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/6.jpg)
Diffraction Pattern
![Page 7: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/7.jpg)
Angular Resolution
• Larger aperture (diameter) telescopes have smaller diffraction patterns
• The smaller the diffraction patterns result in better angular resolution (more detail)
• Diffraction limit in arcseconds = 2.5 105 (/D) = wavelength D = aperture
• Smallest detail that can be resolved
![Page 8: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/8.jpg)
Bigger is Better
1. Better sensitivity: more light gathering area
2. Better angular resolution in most instances: more detail
Figure shows effect of larger aperture
![Page 9: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/9.jpg)
Seeing: Atmospheric Effect
![Page 10: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/10.jpg)
Why Put a Telescope in Orbit?
• The only reason to put a visible light telescope in space is to improve resolution!
• a) ground-based b) damaged Hubblec) enhanced image d) repaired Hubble
![Page 11: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/11.jpg)
Atmospheric Windows
• Certain wavelengths require orbiting telescopes• Radio and visible light can be done from ground
![Page 12: Telescopes Collect more light than eye More detailed images than human eye Larger aperture is better –Aperture refers to the diameter of the primary lens](https://reader035.vdocuments.net/reader035/viewer/2022062715/56649d785503460f94a5b1e6/html5/thumbnails/12.jpg)
Mauna Kea