© 2002 J.Paul
Robinson, Purdue University BMS 631- Flow Cytometry lecture002.ppt

Page 30

Brewster’s Angle

•Brewster’s
angle is the angle at which the reflected
light is linearly polarized
normal to the plane incidence

•At the end of the plasma tube, light can leave through a
particular angle (Brewster’s
angle) and essentially be highly polarized

•Maximum polarization occurs when the angle between
reflected and transmitted light
is 90o

thus Ø*r* + Ø*t* = 90o

since sin (90-x) = cos
x

Snell’s provides (sin Ø*i* / cos Ø*i * ) = n2/n1

Ø*r* is Brewster’s angle

Shapiro p 82

Ø*r * = tan -1 (n2/n1)