| 11. | Geometrical optics does not account for certain optical effects such as diffraction and imaging, including optical aberrations.
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| 12. | These optical aberrations are not normally seen in daylight because they require a dark background to be seen.
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| 13. | In 1950 he created an aerial 90?viewing-angle lens Aviogon, which was free from optical aberrations.
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| 14. | Piston and tilt are not actually true optical aberrations, as they do not represent or model curvature in the wavefront.
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| 15. | While in principle a lens elements is required to correct ( as much as possible ) the many optical aberrations that arise.
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| 16. | Additionally, the light is reflected off of a deformable mirror before and after exposure to the eye to diffuse optical aberrations.
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| 17. | However, precision optical surfaces normally need the reflective material on the front surface of the glass to avoid introducing optical aberrations.
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| 18. | In contrast to the microscope, the objective lens of the telescope was designed with a large focal length to avoid optical aberrations.
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| 19. | These optical aberrations diminish the quality of the image formed on the retina, sometimes necessitating the wearing of spectacles or contact lenses.
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| 20. | It is more difficult to reduce optical aberrations in telescopes with low f-ratio than in telescopes with larger f-ratio.
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