Geography
A ray of light passes from air into water, striking the surface of the water with an angle of incidence of 45. Which of the following four quantities change as the light enters the water: (1) wavelength, (2) frequency, (3) speed of propagation, and (4) direction of propagation?a) 1 and 2 onlyb) 2, 3, and 4 onlyc) 1, 3, and 4 onlyd) 3 and 4 onlye) 1, 2, 3, and 4