question_answer 46)

  There are certain materials developed in laboratories which have a negative refractive index, Fig. 6(EP).3. A ray incident from air       (medium 1) into such a medium (medium 2)       shall follow a path given by                    

Answer:

  (a)  According to Snell's law, As  is negative ; sin r is negative. Therefore, r is negative. The path shown in Fig. 6(EP).3(a) is correct