boundary
i
i
i
r
r
r
A:
3.0
×
10
8
m
s
−
1
3.0\times10^8\,\mathrm{m\,s^{-1}}
3.0
×
1
0
8
m
s
−
1
B:
2.0
×
10
8
m
s
−
1
2.0\times10^8\,\mathrm{m\,s^{-1}}
2.0
×
1
0
8
m
s
−
1
boundary
i
i
i
r
<
i
r<i
r
<
i
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slower
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