Final answer:
Photons are particles of light, reflection is the bouncing of a wave off a surface, refraction is the bending of a wave as it passes from one medium into another, spectrum is the band of colors formed when light is dispersed, vacuum is a space with no air, and wavelength is the distance between points on a wave.
Step-by-step explanation:
- Photons: Particles of light.
- Reflection: The bouncing of a wave off the surface of a substance.
- Refraction: The bending of a wave as it passes from one medium into another, or as it passes through a non-uniform medium.
- Spectrum: The band of colors formed when a beam of light is dispersed.
- Vacuum: A space or area with no air.
- Wavelength: The distance from a point on one wave to a similar point on another wave.