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Refractive index of glass w.r.t water is...

Refractive index of glass w.r.t water is `9//8`. What is the speed of light in water ? Given speed pf light in glass is `2 xx 10^(8) m//s`.

A

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

B

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

C

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

D

none of these

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The correct Answer is:
C
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