question_answer

Bravo and Ronald live in the adjacent rooms separated by a wall. There are few holes on the wall through which light can pass. If the light of one room is switched on and the other is switched off then one can easily see inside of the other room through the hole. But, if the light of both room are switched on simultaneously it appears dark at the hole. Thus we can say that if the two light of equal wavelength are superimposed, it produces:

A) Light band

B) Dark band

C) Red light

D) Blue light

E) None of these