What if a wave traveled to the right on a string and its reflection were not inverted? would a standing wave still result? use the trigonometric identity for the sum of the sines of two angles, eq. 2.16, and follow the example presented in eq. 2.1 through eq. 2.5 to answer this question?

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