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Hot mirror in front of the image sensor of a DSLR. Note reddish reflection of ambient light, and teal edge of filter. A hot mirror is a specialized dielectric mirror, a dichroic filter, often employed to protect optical systems by reflecting infrared light back into a light source, while allowing visible light to pass.
There are no mirror reflection (m) operations for the dichromatic triangle, as there would be if all the smaller component triangles were coloured white. However, by introducing the anti-mirror reflection (m') operation the full dihedral D3 symmetry is restored. The six operations making up the dichromatic D3 (3m') point group are: identity (e)
The original meaning of dichroic, from the Greek dikhroos, two-coloured, refers to any optical device which can split a beam of light into two beams with differing wavelengths.
The color transmitted by the filter exhibits a blue shift with increasing angle of incidence, see Dielectric mirror. In a dichroic mirror or filter, instead of using an oil film to produce the interference, alternating layers of optical coatings with different refractive indices are built up upon a glass substrate. The interfaces between the ...
Dichromatic may refer to: Dichromacy , a form of color-blindness in which only two light wavelengths are distinguished rather than the usual three Dichromatic, describing an optical device which splits light into two parts according to its wavelength: a form of dichroism
A dichromatic color space can be defined by only two primary colors. When these primary colors are also the unique hues, then the color space contains the individuals entire gamut. In dichromacy, the unique hues can be evoked by exciting only a single cone at a time, e.g. monochromatic light near the extremes of the visible spectrum.
Dichroic mirrors are used in some ellipsoidal reflector spotlights to split off unwanted infrared (heat) radiation, and as output couplers in laser construction. A third version of the beam splitter is a dichroic mirrored prism assembly which uses dichroic optical coatings to divide an incoming light beam into a number of spectrally distinct ...
Some filters, like mirrors, interference filters, or metal meshes, reflect or scatter much of the non-transmitted light. The ( dimensionless ) Optical Density of a filter at a particular wavelength of light is defined as − log 10 T {\displaystyle -\log _{10}T} where T is the (dimensionless) transmittance of the filter at that wavelength.