light
light comes from things like the sun,light bulbs and candles.It bounces of things and allows us to see.
light source
the place from Which light originates
light path
the trajectory that light travels
Rays
ray is a beam of light
medium
a substance that moves energy,light,or sound waves from one place to another
refraction
the bending of light or other waves when they pass from one transparent substance to another
reflection/reflect
the return of light or other waves when they pass from a surface,the production of an image or mirror
absorption/absorb
the process of taking in something,such as light energy