Afisherman sees his boat moving up and down, owing to waves on the water. it takes 2.5 s for the boat to travel from its highest to lowest point, a distance of 0.62 m. the fisherman sees that the wave crests are spaced 6 m apart. how fast are the waves traveling?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90