Velocity in Different Mediums

The velocities of light in two different mediums are 2xx10^(8) ms^( -1) and 2.5xx10^(8) ms^(-1) respectively. The critical angle for there mediums is

The EM waves when travel into different medium gets

A student when discussing the properties of a medium ( except vaccum) writes Velocity of light in vaccum = Velocity of light in medium This formula is

If critical angle for TIR from medium to vacuum is 45 deg then velocity of light in medium

The velocity of light is different in different media.

A sound wave travelling with a velocity V in a medium A reaches a point on the interface of medium A and medium B . If the velocity in the medium B be 2 V , then the angle of incidence for total internal reflection of the wave will be greater than:

The critical angle of a prism is 30^(@) . The velocity of light in the medium is