The refractive index of glass w.t.r. a m...

The refractive index of glass w.t.r. a medium is `4/3` . If `v_m - m_E = 6.25 xx 10^(7)`m/s. then the velocity oflight in the medim will be

`2.15xx 10^8 m//s`

`2.5 xx xx 10^8 m//s`

`2.25 xx 10^8 m//s`

`1.5 xx 10^8 m//s`

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