question_answer 36)

  A light ray enters from medium A to medium B as shown in the figure. The refractive index of medium 6 relative to A will be (a) greater than unity                                                     (b) less than unity (c) equal to unity                                                              (d) zero

Answer:

                  (A) Since light rays in the medium 6 goes towards normal. So it has greater refractive index and lesser velocity of light w.r.t. medium/A. So refractive index of medium B  w.r.t. medium A is greater than unity.