Light takes time t_1 to travel a distance x_1 in vaccum 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 time t_1 to travel a distance x_1 in vaccum and the same l

1.	Light takes time t_1 to travel a distance x_1 in vaccum and the same light takes time t_2 to travel a distance x_2 in a medium. The critical angle for that medium is
Answer» `sin^-1((x_2t_2)/(x_1t_1))` `sin^-1 ((x_1 t_2)/(x_2 t_1))` `sin^-1 ((x_1t_1)/(x_2t_2))` `sin^-1((x_2t_1)/(x_1t_2))` ANSWER :D