Could someone tell me if I did this right? A narrow beam of sodium yellow light, with wavelength 589 nm in vacuum, is incident from air onto a smooth water surface at an angle of incidence of 35.0 degrees. Determine the angle of refraction and the wavelength of the light in water. I did... sin(35 degrees)=1.333*sin(theta) theta = 25.486 degrees 589 nm = 1.333*lambda lambda = 441.86 I'm just not sure I used the right equation/setup. And I can't figure out this problem... Unpolarized light in vacuum is incident onto a sheet of glass with index of refraction n. The reflected and refracted rays are perpendicular to each other. Find the angle of incidence. I figured Theta1 + Theta2 = 90 degrees and I tried to find a way to solve it using sin(Theta1) = n*sin(Theta2) but it's not working out. Thanks.