Question 1 Unsaved ume the double-slit experiment described in Problem 6 (with the 3rd dark fringe observed at +36.0° from the central bright one) was actually perfomed when the entire apparatus (laser, double-slit, screen) was immersed in air. At what angle, 6, measured from the central bright fringe, will the 3rd dark fringe be observed if that same entire apparatus is now submerged in water, with an index of refraction nwater 1.33? Hints: For air, NAir 1.00. The vacuum wavelength of the laser and the distance between the two slits is the same in both experiments. (A) ±28.0° (B) A 3rd dark fringe cannot be observed under water. (C) ±26.2° (D) ±51.42° (E) ±15.4°

Question 1 Unsaved ume the double-slit experiment described in Problem 6 (with the 3rd dark fringe observed at +36.0° from the central bright one) was actually perfomed when the entire apparatus (laser, double-slit, screen) was immersed in air. At what angle, 6, measured from the central bright fringe, will the 3rd dark fringe be observed if that same entire apparatus is now submerged in water, with an index of refraction nwater 1.33? Hints: For air, NAir 1.00. The vacuum wavelength of the laser and the distance between the two slits is the same in both experiments. (A) ±28.0° (B) A 3rd dark fringe cannot be observed under water. (C) ±26.2° (D) ±51.42° (E) ±15.4°