snellslaw Messages 16 Reaction score 0 Thread starter Jun 5, 2012 #1 I get how to go from 5 to 6 (set cosα=0) but how do you get 7? Thanks! Attachments Capture.jpg 21 KB · Views: 474
D H Staff Emeritus Science Advisor Homework Helper Insights Author Messages 15,524 Reaction score 771 Jun 5, 2012 #2 Use (6) in conjunction with cos(α)≠0.