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In optics, a diaphragm is a thin opaque structure with an opening ( aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop ...
The diaphragm is a thin skeletal muscle that sits at the base of the chest and separates the abdomen from the chest. It contracts and flattens when you inhale. This creates a vacuum effect that ...
A condenser (right) and its respective diaphragm (left) A condenser is an optical lens that renders a divergent light beam from a point light source into a parallel or converging beam to illuminate an object to be imaged. Condensers are an essential part of any imaging device, such as microscopes, enlargers, slide projectors, and telescopes.
Dark-field microscopy (also called dark-ground microscopy) describes microscopy methods, in both light and electron microscopy, which exclude the unscattered beam from the image. Consequently, the field around the specimen (i.e., where there is no specimen to scatter the beam) is generally dark. In optical microscopes a darkfield condenser lens ...
Nausea. Vomiting. Bloody diarrhea. Lumps or bumps on the skin of the belly or legs that come and go over time. Some people with chronic paragonimiasis have no noticeable symptoms. In up to 25% of ...
Optical aberration. 1: Imaging by a lens with chromatic aberration. 2: A lens with less chromatic aberration. In optics, aberration is a property of optical systems, such as lenses, that causes light to be spread out over some region of space rather than focused to a point. [1]
A tracheostomy is a hole that a doctor creates in your windpipe to help you breathe. Learn more about when you would need a tracheostomy, the procedure, aftercare, risks, and results.
The diaphragm is a dome-shaped muscular barrier between the chest and abdominal cavities. It separates your heart and lungs from your abdominal organs (stomach, intestines, spleen, and liver).
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