Gupta Ravi Asked: January 4, 2025In: Class 12 Physics If a ray of light propagates from a rarer to a denser medium, how does its frequency change? Frequency remains unchanged. Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025. chapter 9 ray optics and optical instrumentsray of light propagates from a rarer to a densershort answer questions