GKFix MCQ Question

What is the speed of light in a medium with n = 1.5?

• A. 3.0 × 10⁸ m/s
• B. 2.5 × 10⁸ m/s
• C. 2.0 × 10⁸ m/s
• D. 1.8 × 10⁸ m/s