The essential condition for total internal reflection to occur is:

angle of incidence $i$ > critical angle $i_c$

The correct answer is Option (1) → angle of incidence $i$ > critical angle $i_c$

For total internal reflection to occur, two conditions must be met -

(1) Light travels from denser to rarer medium

(2) Angle of incidence, $i$ > Critical Angle, $i_c$