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

(N/A) No,the prediction is not confirmed. According to Newton's corpuscular theory,when light corpuscles travel from a rarer medium (air) to a denser medium (water),they experience an attractive force normal to the interface. This force increases the normal component of the velocity,while the tangential component remains constant. This leads to the relation $v = \mu c$,where $v$ is the speed in the medium and $c$ is the speed in vacuum. Since the refractive index $\mu > 1$,the theory predicts $v > c$.
This prediction contradicts experimental results,which show that the speed of light in a denser medium is less than in a vacuum $(v < c)$. The wave theory of light,proposed by Huygens,correctly predicts that $v = c / \mu$,which is consistent with experimental observations.