homework help 231

The speed of light decreases.

The speed of light in a medium is inversely proportional to the refractive index of the medium.

##v=frac{v_0}{n}##, where

##v## is the speed of light in a particular medium.
##v_0=3##x##10^8##m/s is the speed of light in vacuum, whose refractive index is 1.
##n## is the refractive index of the medium.

In water, the speed of light is ##frac{v_0}{1.33}=2.26##x##10^8##m/s.

In glass, the speed of light is ##frac{v_0}{1.52}=1.97##x##10^8##m/s.

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