= - 2. A small surface of area A₁ 103 m² is known to emit diffusely, and from measurements the total intensity associated with emission in the normal direction is In 7000 W/m²-sr. Radiation emitted from the surface is intercepted by two other surfaces of area 42 = 43 = 103 m², which are oriented as shown. What is intensity associated with emission in each of the two directions? What are the solid angles subtended by the three surfaces when viewed from 4₁? What is the rate at which radiation emitted by A₁ is intercepted by the two surfaces? (30 pt) A₁ €60° r=lm 120° A₁₂ 30°