Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative picture of light is consistent with experiment?

Explanation

In corpuscular theory refraction is due to attraction of light particles and that of refracting medium. This results in an increase of the velocity. This means
`c sin I = v sin r `or `v/c=(sin i)/(sin r)=n`. Since `ngt1, vgtc`
The prediction is opposite to the experiment results `(v lt c)`.The wave picture of light is consistent with the experiment.