Material A has critical angle i_A, and material B has critical angle i_B(i_B > i_A).
Then which of the following is true 
 (i) Light can be totally internally reflected when it passes from B to A
(ii) Light can be totally internally reflected when it passes from A to B
(iii) Critical angle for total internal reflection is  
(iv) Critical angle between A and B is ${\sin }^{-1}\left(\frac{\sin {\mathrm{i}}_{\mathrm{A}}}{\sin {\mathrm{i}}_{\mathrm{B}}}\right)$