Light Having a Speed in Vacuum of 3

Multiple Choice

Light having a speed in vacuum of 3.0 × 10⁸ m/s enters a liquid of refractive index 2.0.In this liquid,its speed will be:

A) 6.0 × 10⁸ m/s
B) 3.0 × 10⁸ m/s
C) 1.5 × 10⁸ m/s
D) 0.75 × 10⁸ m/s
E) None of the above choices are correct.