Physical Optics_21

The speed of light in empty space is about 300 million m/s. Light passing through a material such as air, water, or glass, however, travels more slowly than this. This is because the atoms that make up the material interact with the light waves and slow them down. List 1 compares the speed of light […]

If a ray of light travel from medium 1 to medium 2 along a certain path, it retraces the path, when it passes from medium 2 to medium 1. Thus the path of light is reversible. And this principle is known as the principle of reversibility of light. Here we also derive the relationship equation […]