Physics for IGCSE & O level - Rays And Waves (Section 6 - No. 35)
What is the speed of light in a medium?
Always the same as the speed in a vacuum.
Always faster than the speed in a vacuum.
Always slower than the speed in a vacuum.
It depends on the color of light.
คำอธิบาย
The speed of light is always slower than in a vacuum.