We are given with distance traveled through vacuum = 1.0 m refractive index of water = 1.33 refractive index of glass = 1.50 refractive index of diamond = 2.42
distance traveled through water is = 1.0/1.33 = 0.75 m distance traveled through water is = 1.0/1.50 = 0.67 m distance traveled through water is = 1.0/2.42 = 0.41 m