<p align="right">Last Update: <font color="#4f81bd">July, 22, 2024</font></p> ## BIG IDEAS - When light enters a different medium, its speed and wavelength change, but its frequency remains constant. - When light travels from a medium with a higher refractive index to one with a lower refractive index, there is a specific angle of incidence called the critical angle. --- Return [[Home|Home]] | [[Oscillations]] | [[Electromagnetic radiation]] | [[Module 5 Electromagnetic Spectrum]]