Using the Huygens — Fresnel principle, prove that when a plane wave falls
on the interface of two media: a) the angle of incidence is equal to the angle
of reflection (α = α − 3); b) the ratio of the sine of the angle of incidence to
1
the sine of the angle of refraction is equal to the ratio of the wave velocity in
the first medium to the wave velocity in the second medium (sinα1 = v1 ).
sinα2 v2
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