The transmissivity T of a transparent material 20 mm thick to normally incident light is 0.80 . If the index of refraction of this material is 1.6, compute the thickness of material that will yield a transmissivity of 0.75 . All reflection losses should be considered. mm eTextbook and Media Attempts: 0 of 2 used Using multiple attempts will impact your score. 5% score reduction after attempt 1