Recommended reflection factors include each of the following, except -: (A) Ceilings 80%, (B) Roofs 40%, (C) Walls 50 to 60%, (D) Furnitures 30 to 40%
Answer is B. (PARK TB 23rd edtn pg 740) Recommended reflection factors include:- - ceilings and roofs - 80% - walls - 50 to 60% - furniture - 30 to 40% - floor not more than 15 to 20%