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Waves Refraction using Huygens’ Principle (continued) The next diagram shows how to use Huygens’ principle to produce a simple equation to predict how a set of waves will move when going from one medium to another.
Angles ABC and ADC are 90°.
which gives us
which means that, for a given pair of
media, the ratio,
sin The angle between a normal line and the
direction of propagation in medium one is called the
angle of incidence
(equal to
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1
to sin
1).
The angle between a normal line and the direction of
propagation in medium two is called the
angle of refraction
(equal to