Solar optical properties
Any optical material obey the following law under any given wave length: T+a+p=1
T, a, and p are function of А,
Total solar heat excluded-16%
Total solar heat admitted-84%
Figure 6-10 Distribution of solar radiation falling on clear plate glass.
Where t = transmittance
A = absorptance p = reflectance X = wave length (m)
Transmitted solar radiation-80%
А, f = c
Where f = frequency (HZ)
C = light speed (3xl08 m/s)
Opaque to long-wave radiation Transparent to short-wave radiation (sun light)
This is the well-known greenhouse effect.