i need help on number 4.

11/7/2005 11:52:10 PM

The light beam in Figure P22.43 strikes surface 2 at the critical angle,(theta) c = 42°. Determine the angle of incidence,(theta) i.

11/8/2005 12:05:34 AM

help me

11/8/2005 1:47:41 AM

Use Snell's law plus the critical angle formula.

11/8/2005 2:28:56 AM

i've been using those two equations but my answers are not working.

(n2/n1)(sin 90) = 42°
(n2/n1) = .743
n2 = 1 n1 = 1.346

1.346sin(theta)1 = 1sin(18°)
theta1 = 24.58°


but that is wwong...what am i doing wrong?

11/8/2005 11:25:33 AM

nm...googled that shit and found a problem just like it that was solved

thank YOU google.

11/8/2005 11:47:26 AM