Recent content by HoangFat

Omg ! I found another question about degenerate perturbation, in some book I found I only contain the first approx, but the second approx ? A electric field affect to a rigid rotator (2 different charge at 2 poles of the rigid rotator)

sin(x+y) = sinx*cosy+siny*cosx

Ya ! I used the Snell's law in Geometry Methol, but I think using the wave mothol in sloving, If you use the Sneel's law you 'll got the unsloveable quation T.T

Well, this is the question from the end term exam of the Optic 1 year 1 ago that I got from the senior, we (me and my friends) get confused. I try to slove this problem by Geometry Optic but the final equation can't slove (if sloved it will be loooooong to slove on the short time). I think...