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It is found that all electromagnetic sig...

It is found that all electromagnetic signals sent from A towards B reach point C inside the glass sphere, as shown in figure. The speed of electromagnetic signals in glass cannot be:

A

`1.0 xx 10^(8)m//s`

B

`2.4 xx 10^(8)m//s`

C

`2 xx 10^(7) m//s`

D

`4 xx 10^(7)m//s`

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