(Figure 1) shows the interference pattern obtained in a double-slit experiment with light of wavelength . Figure1 of 1 The figure shows an interference pattern, consisting of alternating bright and dark horizontal fringes. The center of the pattern is a bright fringe labeled as B. The brightness of other bright fringes slowly decreases with distance from the central fringe. The second bright fringe above fringe B is labeled as A. The second dark fringe below fringe B is labeled as C. The second bright fringe below fringe B is labeled as D. The third bright fringe below fringe B is labeled as E. Part A Identify the fringe or fringes that result from the interference of two waves whose path difference differs by exactly 2 . Select all that apply. View Available Hint(s)for Part A A B C D E Part B The same double-slit experiment is then immersed in water (with an index of refraction of 1.33) and repeated. When in the water, what happens to the interference fringes? View Available Hint(s)for Part B They are more closely spaced than in air by a factor of 1.33. They are more widely spaced than in air by a factor of 1.33. They are spaced the same as in air. They are shifted upward. They are shifted downward.

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