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Index
»
Gemmology
»
Colour
»
Tools for colour in depth
level: Tools for colour in depth
Questions and Answers List
level questions: Tools for colour in depth
Question
Answer
What is the name of the tool that contains 5 connected glass prisms?
Prism spectroscope
What must the glass prisms be in a prism spectroscope to avoid confusing readings?
Singly refractive
Various parts of the prism spectroscope come into focus at slightly different distances from the... ?
Eyepiece
The dispersion of colours by the prism spectroscope is not _____ througout the spectrum.
Equal
The prism spectroscope produces one strong bright ________ .
Spectrum
What is the type of spectroscope that produces a more observale spectrum using parrallel lines?
Diffraction Grating
The diffraction grating spectroscope produces a linear spectrum, meaning all the wavelengths are equally _________ .
Separated
True or false - All coloured gemstones have absorption spectra seen via a spectroscope?
False
True or false - Some colourless gem materials still show absorption spectra?
True
Pleochroism in some gem materials can show different absorption patterns in different __________ .
Directions
What is the name of the tool that has a calcite block encased in a tube, with an aperture at one end, and a lens at the other?
Calcite Dichroscope
Calcite is ideal to use for a dichroscope because it has a very high _____________ and shows two clear images.
Birefringence