OPTI 201R L28-1 - 271 Chapter 9: Optical Apertures Figure...

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OPTI 201R Fall 2009 271 Chapter 9: Optical Apertures Figure 9.1 An aperture stop and a field stop. ! A stop (diaphragm) is a circular opening in an optical system. (think of an opaque plate with a hole in it, a lens, a mirror, etc.) ! Two types of stops in optical systems: Aperture Stop ("Astop") - The aperture stop is the opening that limits the amount of light that passes through the optical system, from the object to the image. - Light is uniformly distributed across the aperture stop. - Blocking part of this light does not block out part of the image. (black tape experiment in lab) - The amount of light passing through the system is proportional to the area of the aperture stop: 2 4 Astop d amount of light ! "
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OPTI 201R Fall 2009 272 - In many optical systems the first mirror or lens is the aperture stop (primary mirror in a telescope, object lens in binoculars). - Two reasons large-diameter aperture stops are desirable: (1) collect as much light as possible (2) increase image resolution (topic for your Jr. year!!!) - The aperture stop may be located anywhere in an optical system,
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OPTI 201R L28-1 - 271 Chapter 9: Optical Apertures Figure...

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