Consider two surfaces, one absolutely black and the other non-black. These surfaces are arranged parallel to each other and so close that the radiation of one falls totally on the other. Choose the correct option

• A. 1 denotes the radiant energy E emitted by the non-black surface impinges on the black surface
• B. 1 denotes the radiant energy E emitted by the black surface impinges on the non-black surface
• C. 2 and 3 denotes the quantity α E b
• D. 4 denotes the quantity (1 – α) E b