Asked by Amber

A certain wave is incident on an interface at an angle of 40 deg. The wave emerges into the other material at an angle of 30 deg. Crossing the interface, the wave:
a. increased speed
b. reduced speed
c. maintained constant
d. more info is needed

I think reduces its speed, but I'm not sure, so I'm caught between b and d....

Help me someone, please!
Answered by josh
i think it would be b too bc the degress dropps from 40 to 30 so im saying your right on b
Answered by bobpursley
When in doubt, use snell's law.

N1Sin40=N2sin30

N1/N2=sin30/sin40

which means N1 is less than N2, which means N2 the speed is slower. b
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