Force acting on a charged particle in a magnetic field B is given by,
F = q v x B
where,
v is the velocity of the charged particle and
b is the magnetic field acting on the particle.
The refractive indices of water, diamond and glass are 1.33, 2.0 and 1.5 respectively. In which of these will the speed of light be the maximum ? Justify your answer with a suitable reason.