α=45 β=30 v=?
===
n=sinα/sinβ=c/v
v=c*sinβ/sinα=3*10^8*sin30/sin45=2.14*10^8 м/с
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α=45 β=30 v=?
===
n=sinα/sinβ=c/v
v=c*sinβ/sinα=3*10^8*sin30/sin45=2.14*10^8 м/с
===========================================