The velocity of light in glass is `2 xx 10^(8)ms^(-1)` while that in vaccum is `3 xx 10^(8)ms^(-1)`. By how much would an ink dot appeat to be raised

The velocity of light in glass is `2 xx 10^(8)ms^(-1)` while that in vaccum is `3 xx 10^(8)ms^(-1)`. By how much would an ink dot appeat to be raised
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The velocity of light in glass is `2 xx 10^(8)ms^(-1)` while that in vaccum is `3 xx 10^ ... raised when covered by a glass plate of 4.5 cm thickness.
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