The goal of this experiment was to answer the question, "How does diffraction occur?" Suppose you formulated this alternate hypothesis: If the gap width is increased while keeping wavelength constant, then the observed diffraction will decrease because the less the ratio between wavelength and gap width is, the smaller the observed diffraction angle will be. To test this hypothesis, you would change the and observe the in the system. Therefore, the independent variable would be the and the dependent variable would be the.