Explanation:
Lets take G is the incident radiation on the body.
[tex]G=G_a+G_r+G_t[/tex]
Where
[tex]G_a[/tex]absorptive part of G
[tex]G_r[/tex] reflected part of G
[tex]G_t[/tex]transmitted part of G
lets take a is the absorptivity ,r is the reflectivity and t is the transmissivity.
So [tex]G_a=a G,G_r=r G,G_t=t G[/tex]
G=a G+r G+t G
So We can say that
1=a+r+t
We can say that
absorptivity is the capacity of a body to absorb the incident radiation.
reflectivity is the capacity of a body to reflect the incident radiation.
transmissivity is the capacity of a body to transmit the incident radiation.
