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4. The transmissivity T of a transparent material 20 mm thick to normally incident
light is 0.85. If the index of refraction of this material is 1.4, compute the
thickness of material that will yield a transmissivity of 0.75. All reflection losses
should be considered. Transmissivity T is a ratio of intensity (I) of the light
going out of the material to that (Io) of the incident light.

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