Making use of the expressionfor an absorbing medium, we define a quantity called the unit...

Making use of the expression

for an absorbing medium, we define a quantity called the unit trans-mittance. T1. At normal incidence, Eq. (4.55), T = It/Ii and thus when y = 1, T1 ≡ I(1)/Io. If the total thickness of the slides in the previous problem is d and if they now have a transmittanee per unit length T1, show that