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- Amici_prism abstract "An Amici prism, named for the astronomer Giovanni Amici, is a type of compound dispersive prism used in spectrometers. The Amici prism consists of two triangular prisms in contact, with the first typically being made from a medium-dispersion crown glass, and the second a higher-dispersion flint glass. Light entering the first prism is refracted at the first air-glass interface, refracted again at the interface between the two prisms, and then exits the second prism at near-normal incidence. The prism angles and materials are chosen such that one wavelength (colour) of light, the centre wavelength, exits the prism parallel to (but offset from) the entrance beam. The prism assembly is thus a direct-vision prism, and is commonly used as such in hand-held spectroscopes. Other wavelengths are deflected at angles depending on the glass dispersion of the materials. Looking at a light source through the prism thus shows the optical spectrum of the source.By 1860, Amici realized that one can join this type of prism back-to-back with a reflected copy of itself, producing a three-prism arrangement known as a double Amici prism. This doubling of the original prism increases the angular dispersion of the assembly, and also has the useful property that the centre wavelength is refracted back into the direct line of the entrance beam. The exiting ray of the center wavelength is thus not only undeviated from the incident ray, but also experiences no translation (i.e. transverse displacement or offset) away from the incident ray's path.Amici himself never published about his nondeviating prism, but rather communicated the idea to his friend Donati, who constructed the device for observations of stellar spectra. Donati's publications of his observations (in 1862) were the first disclosure of the prism doubling idea, and because the prism was practical to build and much more compact than multiple prism arrangements typical of that period for producing high spectral dispersion, Amici's invention quickly caught the attention of researchers throughout Europe. However, the dispersion of Amici prisms can be accurately calculated using the multiple-prism dispersion theory assuming no spatial separation between the prism components.The dispersive Amici prism should not be confused with the non-dispersive Amici roof prism.".
- Amici_prism thumbnail Amici_direct-vision_prism-fs_PNr°0118.jpg?width=300.
- Amici_prism wikiPageID "2662771".
- Amici_prism wikiPageRevisionID "601849575".
- Amici_prism hasPhotoCollection Amici_prism.
- Amici_prism subject Category:Italian_inventions.
- Amici_prism subject Category:Prisms.
- Amici_prism type Ability105616246.
- Amici_prism type Abstraction100002137.
- Amici_prism type Attribute100024264.
- Amici_prism type Cognition100023271.
- Amici_prism type Creativity105624700.
- Amici_prism type Invention105633385.
- Amici_prism type ItalianInventions.
- Amici_prism type Polyhedron113883885.
- Amici_prism type Prism113884511.
- Amici_prism type Prisms.
- Amici_prism type PsychologicalFeature100023100.
- Amici_prism type Shape100027807.
- Amici_prism type Solid113860793.
- Amici_prism comment "An Amici prism, named for the astronomer Giovanni Amici, is a type of compound dispersive prism used in spectrometers. The Amici prism consists of two triangular prisms in contact, with the first typically being made from a medium-dispersion crown glass, and the second a higher-dispersion flint glass. Light entering the first prism is refracted at the first air-glass interface, refracted again at the interface between the two prisms, and then exits the second prism at near-normal incidence.".
- Amici_prism label "Amici prism".
- Amici_prism label "Geradsichtprisma".
- Amici_prism label "Prisme d'Amici".
- Amici_prism label "Pryzmat Amiciego".
- Amici_prism label "阿米西稜鏡".
- Amici_prism sameAs Geradsichtprisma.
- Amici_prism sameAs Prisme_d'Amici.
- Amici_prism sameAs Pryzmat_Amiciego.
- Amici_prism sameAs m.07w7qd.
- Amici_prism sameAs Q586325.
- Amici_prism sameAs Q586325.
- Amici_prism sameAs Amici_prism.
- Amici_prism wasDerivedFrom Amici_prism?oldid=601849575.
- Amici_prism depiction Amici_direct-vision_prism-fs_PNr°0118.jpg.
- Amici_prism isPrimaryTopicOf Amici_prism.
