* Light as a wave: Light is an electromagnetic wave, which means it's made up of oscillating electric and magnetic fields. These fields travel through space at the speed of light.
* Light as a ray: To simplify the study of light, we often represent the wave as a straight line called a ray. This ray indicates the direction in which the light energy is propagating.
* Real vs. idealized: In reality, light waves can bend and spread out (diffract). However, using rays allows us to make accurate predictions about how light will travel in most situations, especially when dealing with reflection and refraction.
In summary, a light ray is a tool we use to visualize the direction of light energy, not an actual physical entity.
