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Light travels with a velocity 1.5 xx 10^...

Light travels with a velocity `1.5 xx 10^(8) m//s` in a medium. On entering second medium its velocity becomes `0.75xx10^(8) m//s`. What is the refractive index of the second medium with respect of the first medium ?

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Given `:` Velocity of light in the first medium ` = v_(1) = 1.5 xx 10^(8) m//s`, velocity of light in the second medium` = v_(2) = 0.75 xx 10^(8) m//s `
refractive index of the secod medium with respect to the first medium ` = ._(2)n_(1) =?`
`._(2)n_(1) = ( v_(1))/(v_(2))`
`._(2)n_(1) = ( 1.5 xx 10^(8))/( 0.75 xx 10^(8))= 2 `
Hence, the refractive index of the second medium with respect to the first medium is 2.
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