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

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

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 .....

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

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

The time taken by the light to travel a distance of 3 cm is :