If light travels a distance `x` in `t_(1)` sec in air and `10x` distance in `t_(2)` sec in a medium, the critical angle of the medium will be

A ray of light covers distance .d. in time t, in air and distance 10 d in time t_2 , in medium, then critical angle for medium is .....

Light takes of t_(1) to travel a distance x_(1) in vacuum and the same light takes time t_(2) to travel a distance x_(2) in a medium. The critical angle for that medium is

Light takes t_(1) second to travel a distance x cm in vacuum and the same light takes t_(2) second to travel 10x cm in medium. The critical angle for the corresponding medium is

Light takes t_(1) second to travel a distance x cm in vacuum and the same light takes t_(2) second to travel 10x cm in medium. The critical angle for the corresponding medium is

In vacum, to travel distance d, light takes time t and in medium to travel distance 5d, it takes time T. The critical angle of the medium is