You investigated a new material and subjected it to the following optical experiments. During a transmission experiment, you observed that, at a thickness of 30 mm, the material transmits only 50% of the intensity. a. What thickness is required to transmit 25% of the incident intensity?  b. What fraction of the incident intensity is absorbed by the material for the thickness solved in a?

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You investigated a new material and subjected it to the following optical experiments. During a transmission experiment, you observed that, at a thickness of 30 mm, the material transmits only 50% of the intensity.

a. What thickness is required to transmit 25% of the incident intensity? 
b. What fraction of the incident intensity is absorbed by the material for the thickness solved in a?

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