Light in air strikes a transparent plate of an unknown material at an angle of incidence of 60 degrees. Part of the beam is reflected and part refracted. A measurement shows that the angle between the reflected and refracted beams is 90 degrees with each other. What is the index of refraction of the material?
2007-12-09 02:09:25 · 3 answers · asked by jb143 1 in Science & Mathematics ➔ Physics
n1sinθ1 = n2sinθ2
where
n1 ≈ 1 ...........for air (roughly)
θ1 = 60
and by looking at a diagram of the problem you get
θ2 = 180 - (60 + 90) = 30
so
n2 = n1sinθ1/sinθ2 = 1*sin60/sin30 = √3 ≈ 1.732
.,.,,.
2007-12-09 02:27:32 · answer #1 · answered by The Wolf 6 · 0⤊ 0⤋
See reference
2007-12-09 03:01:23 · answer #2 · answered by za 7 · 0⤊ 0⤋
n= sin i/ sin r
n=sin 60/ sin 45
n= 1.22
2007-12-09 02:25:11 · answer #3 · answered by Anonymous · 0⤊ 1⤋