Light Crossword

"buildings can be designed to absorb and retain heat"
an extremely small amount of a thing or quality.
1. (of electromagnetic radiation) having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays.
the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
(of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects. noun
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.
a comb or tuft of feathers, fur, or skin on the head of a bird or other animal.
not able to be seen through; not transparent
(of a material or article) allowing light to pass through so that objects behind can be distinctly seen.
(of a substance) allowing light, but not detailed shapes, to pass through; semitransparent.