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The critical angle for a denser-rarer in...

The critical angle for a denser-rarer interface is `45^@`The speed of light in rarer medium is `3xx10^8` m/s. The speed of light in the denser medium is:

A

`3.2xx10^7 m/s`

B

`sqrt2xx10^8 m/s`

C

`2.12xx10^8 m/s`

D

`5xx10^7 m/s`

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