Chapter 12, Problem 12.14P

A small radiant heat source of area $A_1=2x{10}^{-4}{m}^2$ emits diffusely with an intensity $I_1=1000W/m^2·sr.$ A second small area, $A_2=1x{10}^{-4}{m}^2$ , is located as shown in the sketch.

(a) Determine the irradiation of $A_2$ for $L_2=0.5m$ .
(b) Plot the irradiation of $A_2$ over the range $0\le L_2\le 10m$ .