A light wave enters from air into a medi...

A light wave enters from air into a medium of refractive index 1.5 . The speed of light in the medium will be

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

` 4 . 5 xx 10 ^(8) m// s`

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

none of these

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