Question: When a ray of light enters from medium A to medium B, its speed decreases and on further entering into medium C, its speed increases.<br> Which of the following conclusions can be drawn from this ?

  Option 1: Refractive index of A, B, C cannot be compared from above information
  Option 2: Refractive index of A is more than B and C
  Option 3: Refractive index of A is less than B but equal to C
  Option 4: Refractive index of A and C are less than B
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