A) For the ray to bend towards the normal at the prism surface µ2 > µ1 . The ray then movesaway from the normal when it emerges out of the rectangular block. Therefore µ2 > µ3 B) As there is no deviation of the ray as it emerges out of the prism, µ2 = µ1 C) As the ray emerges out of prism, it moves away from the normal. Therefore µ2 < µ1 . Asthe ray moves away from the normal as it emerges out of the rectangular block, therefore µ2 > µ3 D) At the prism surface, total internal reflection has taken place. For this sin 45° >