Problem: You illuminate two very narrow slits in air by monochromatic coherent light and find that the first interference maximum on either side of the central bright spot is at an angle of ±12.0° from the center of the central bright spot. You then immerse the entire apparatus in a transparent liquid and find that the first maximum on either side of the central bright spot occurs instead at ±9.0°. What is the index of refraction of the liquid? (a) 0.5 (b) 1.3 (c) 1.5 (d) 2.0 (e) 3.0 (f) 4.0 (g) none of the above

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You illuminate two very narrow slits in air by monochromatic coherent light and find that the first interference maximum on either side of the central bright spot is at an angle of ±12.0° from the center of the central bright spot. You then immerse the entire apparatus in a transparent liquid and find that the first maximum on either side of the central bright spot occurs instead at ±9.0°. What is the index of refraction of the liquid?

(a) 0.5

(b) 1.3

(c) 1.5

(d) 2.0

(e) 3.0

(f) 4.0

(g) none of the above