Optinen laite Traditional Geocache
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Tason 4 tradi
Level 4 traditional cache
Wikipedia kertoo: Prisma on optinen laite, jolla voidaan
taittaa, heijastaa tai hajottaa valoa valospektrin väreihin,
esimerkiksi auringon valkoista valoa sateenkaaren väreihin.
Prisma on usein muodoltaan geometrinen prisma.
Valon taittuminen aineen rajapinnassa riippuu valon
aallonpituudesta ja väliaineen taitekertoimesta. Valo, joka
sisältää useita aallonpituuksia, taittuu
rajapinnassa siten, että pidemmät aallonpituudet
(punaiset) taittuvat vähiten ja lyhyimmät (violetti)
eniten. Prisman kolmiomuoto korostaa tätä
aallonpituuksien erottumista, kun valo kulkee molempien
rajapintojen läpi.
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ENG:
Wikipedia says:In optics, a prism is a transparent optical
element with flat, polished surfaces that refract light. The exact
angles between the surfaces depend on the application. The
traditional geometrical shape is that of a triangular prism with a
triangular base and rectangular sides, and in colloquial use
"prism" usually refers to this type. Some types of optical prism
are not in fact in the shape of geometric prisms. Prisms are
typically made out of glass, but can be made from any material that
is transparent to the wavelengths for which they are
designed.
A prism can be used to break light up into its constituent spectral
colors (the colors of the rainbow). Prisms can also be used to
reflect light, or to split light into components with different
polarizations.
Finnish word "Prisma" means "Prism".
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