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Unformatted text preview: ht (so that it only oscillating in one direction) and then pass it through a polarizing
ﬁlter oriented in the opposite direction, no light will escape. This idea is the basis behind the screens on
At a certain angle, referred to as Brewster’s Angle, all of the light reﬂected off the surface of a material
will be polarized in one direction. The equation relating the index of refraction of the material (n2 ), the
index of refraction of the surrounding medium, n1 , and the incident angle (Brewster’s Angle), θB is:
tan θB = 2 n2
n1 (3) 2.4 Total Internal Reﬂection When we look at Snell’s Law, we can consider the case in which light is going from a medium with a
high index of refraction to a medium with a low index of refraction. For example, if light is going from
dense optical media to air. The interesting issue is that mathematically sin θ must always be between 0
and 1. So if ni > nr and sin θr = 1, there is a maximal value of θi (known as the critical angle) where you
can get a solu...
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- Spring '14