Refractive Index in glass = $\frac{velocity\;of\;light\;in\;air}{velocity\;of\;light\;in\;glass}$
1.5 = $\frac{3.0\times 10^8}{v}$
v = 2.0 x 10<sup>8</sup>m/s
johnmulu answered the question on February 14, 2017 at 05:45
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