"In the prison is a switch room, which contains two light switches labeled A and B, each of which can be in either the on or the off position. I am not telling

"In the prison is a switch room, which contains two light switches labeled A and B, each of which can be in either the on or the off position. I am not telling you their present positions. The switches are not connected to anything. The switches are not connected to anything, correct me if I am wrong but how will you find out light is on sufficient number of times