In a water tank experiment, water waves are generated withtheir crests 2.5 cm apart and parallel. They pass though twoopenings 5.0 cm apart in a long wooden board.
(a) If the end of thetank is 2.0 m beyond the boards, where would you stand, relative tothe straight- through direction, so that you receive little or nowave action?
(b) How many such places are there on each side of the straight through position?