When light moves through materials, it can be transmitted, absorbed, or reflected. The transmittance of a material is the proportion of the incident approaching) light that moves all the way through to the other side. The transmittance of a material depends on its thickness, but it
also depends on the type of light. The image in Figure 4 represents visible light transmitting through a certain medium. Because the light is
scattered and an image cannot be clearly resolved, this medium is described as being