Rewrite the equation as .

Divide each term in by .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Rewrite in exponential form using the definition of a logarithm. If and are positive real numbers and , then is equivalent to .

Rewrite the equation as .

Multiply both sides of the equation by .

Reorder factors in .

Solve for I L=10 log of I/I_0