= Opacity (optics)
{wiki=Opacity_(optics)}
In optics, opacity refers to the property of a material that prevents light from passing through it. An opaque material does not allow any light transmission, making it impossible to see through. This is in contrast to transparent materials, which allow most light to pass, and translucent materials, which allow some light to pass but scatter it in different directions. Opacity is typically measured in terms of the percentage of light that is absorbed or reflected by a material versus the percentage that is transmitted.
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