3. The percent of light that will pass through a material is given by the equation logP=-kd, where P is the percent of light passing through the material, k is the constant that depends on the material, and d is the thickness of the material in centimeters. The constant k for a piece of tinted glass is 0.5. How thick a piece of this glass is needed so that 60% of the light that is incident to the glass will pass through it.

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