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Light and Shadow

Across
is equal to one billionth of a volt, is a unit used to measure the force of an electric current.
(of a substance) allowing light, but not detailed images, to pass through; semitransparent.
that are part of the energy that comes from the sun, can burn the skin, and cause skin cancer. UV radiation is made up of three types of rays.
the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei.
the fact or phenomenon of light, radio waves, etc., being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight.
(of electromagnetic radiation) having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays.
not able to be seen through; not transparent.
a band of colors, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength.
Down
(of a substance) having or showing fluorescence.
the measure of the proportion of light or other radiation striking a surface that is reflected off it.
a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.
the rate at which something occurs or is repeated over a particular period of time or in a given sample.
tending to be different or develop in different directions.