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# Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass ? The speed of light vacuum is $$3$$ x $$10^8 ms^{-1}$$.

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 $$10^8 ms^{-1}$$