When the moving light through smoke or dust, is seen as a straight beam and can be penetrated by objects. Objects that allow light through in a straight line to get it. We call this object, that object transparent like glass, air, water, etc. If the light moving through certain types of objects, and the distribution of the light out to the surrounding light moving in a straight line. We call the object if the object is transparent, such as frosted glass. Wax paper, plastic, frosted, etc. The section object that is not moving, the light to pass through. We called an opaque object, such as concrete walls, thick cardboard etc. Some are opaque objects reflect light and absorbs some light cause shadows up.
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