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Answer :
Refractive index of glass, \( n_g \)= 1.50.
speed of light in vacuum:
\(\Rightarrow \) c=\( 3 \) x \( 10^8 ms^{-1} \)
\(\therefore \) Speed of light in glass = \( \frac{c}{n_g} \) = \( \frac{ 3 ×10^8}{1.5} \)
=2 x \( 10^8 ms^{-1} \)