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Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. [ 1] These optically anisotropic materials are described as birefringent or birefractive.
There is more to our images than you can see at first look. If you click on any image on Wikipedia, you will go to a page about the image itself. This image page will have information on the image's source, authorship, and copyright licensing, along with a more detailed description of the image. Unless the image is very small, you will see a ...
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...
The eye of God within a triangle, representing the Holy Trinity, and surrounded by holy light, representing His omniscience. Heptagram. Judaism, Islam, Thelema, Paganism, Alchemy. Represents the seven days of creation. In Islam, it represents the first seven verses of the Quran. It is the symbol of Babalon in Thelema.
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Musical symbols are marks and symbols in musical notation that indicate various aspects of how a piece of music is to be performed. There are symbols to communicate information about many musical elements, including pitch, duration, dynamics, or articulation of musical notes; tempo, metre, form (e.g., whether sections are repeated), and details ...
This chart uses a large area and much "ink" (many symbols and lines) to show only five hard-to-read numbers, 1, 2, 4, 8, and 16. Chartjunk consists of all visual elements in charts and graphs that are not necessary to comprehend the information represented on the graph, or that distract the viewer from this information. [ 1][ 2][ 3] Markings ...
Health threats from cosmic rays are the dangers posed by cosmic rays to astronauts on interplanetary missions or any missions that venture through the Van-Allen Belts or outside the Earth's magnetosphere. [ 1][ 2] They are one of the greatest barriers standing in the way of plans for interplanetary travel by crewed spacecraft, [ 3][ 4][ 5] but ...