By definition, transmittance is:
where "F_t" is the radiant flux transmitted by that material and "F_i" is the radiant flux received by that material. If 1/3 of initial light intensity is absorbed in the material, then the transmited ratio is:
The optical density (or absorbance) is then:
Answer. Transmittance: 0.667. Optical density: 0.176.
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