Everything about Transparency Optics totally explained
In
optics,
transparency is the
material property of allowing
light to pass through. In
mineralogy, another term for this property is
diaphaneity. The opposite property is
opacity. Transparent materials are
clear: they can be seen through.
Translucent materials allow light to pass through them only diffusely: they can't be seen through; contrary to popular belief, translucency doesn't include see-through colored objects such as (for instance)
emerald in its cut state (which is transparent) but does include things such as
frosted glass which allow light to come through but no images.
Transparency
Though transparency usually refers to visible light in common usage, it may correctly be used to refer to any type of
radiation. For example, flesh is transparent to
X-rays, while bone is not, making
X-ray imaging useful for medicine.
Examples of transparent materials are
air and some other
gases,
liquid such as water, most
glasses, and
plastics such as
Perspex. Where the degree of transparency varies according to the
wavelength of the light, the image seen through the material is tinted. This may be due to certain metallic oxide molecules in glass, or larger colored particles, as in a thin
smoke. If many such particles are present the material may become opaque, as in thick smoke.
From
electrodynamics it results that only a vacuum is really transparent in the strict meaning, any matter has a certain absorption for
electromagnetic waves.
There are transparent
glass walls that can be made
opaque by the application of an electric charge, a technology known as
electrochromics.
Certain
crystals are transparent because there are straight lines through the crystal structure. Light passes unobstructed along these lines.
There is a complicated theory "predicting" (calculating) absorption and its spectral dependence of different materials. See:
absorption (optics) - absorption of
photons by a material and
absorption spectroscopy.
Further Information
Get more info on 'Transparency Optics'.
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