# Visual opacity

A light beam propagating through hazy air loses intensity along its path,

 $I = I_{0} \cdot e^{-K \cdot L}$ $K = \frac{-1}{L} \cdot \text{ln} \left( \frac{I}{I_{0}} \right)$
 $I$ intensity of light after a path L $I_{0}$ intensity of light at the source $K$ extinction coefficient in m-1 $L$ path in m
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