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The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope , which is a projector used for projecting images of transparent objects (such as films or slides), and from the epidiascope , which is capable of projecting ...
Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.
The maximum color dosage depends heavily on the polymer used (particle size, surface finish and surface energy), the machine configurations and the pigment load of the liquid color. [1] This can cause problems with very thin-walled parts that must be colored as opaque as possible, or even prevent coloring with liquid color altogether.
The plastic is useful as a sample holder material in microscopy applications as its refractive index is close to that of water at visible wavelengths, [9] [10] (FEP: 1.344, water: 1.335). This minimizes the blur due to optical aberrations when the light traverses the sample container.
3M Introduces Custom Traffic Sign Faces for Full Color, Retroreflective Signage Durable, digitally-printed signs ideal for tourism, way-finding and airports ST. PAUL, Minn.--(BUSINESS WIRE)-- 3M ...
Moving from longer (0.7 μm) to shorter (0.4 μm) wavelengths: Red, orange, yellow, green, and blue (ROYGB) can all be identified by our senses in the appearance of color by the selective absorption of specific light wave frequencies (or wavelengths). Mechanisms of selective light wave absorption include:
The colors seen with this type of dispersion staining are about the same as those with the Becke` Line method shown in Chart 1. Examples of this type of dispersion staining and the colors shown for different λo's can be seen at the microlabgallery.com site for Phase Contrast Dispersion Staining. The presence of two colors helps to bracket the ...
An opaque substance transmits no light, and therefore reflects, scatters, or absorbs all of it. Other categories of visual appearance, related to the perception of regular or diffuse reflection and transmission of light, have been organized under the concept of cesia in an order system with three variables, including opacity, transparency and ...
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