light

all metals can reflect the light

there are wave lengths that range from 390 to 700 nanometers

you got light sources like

electric discharge,lamps,

nuclear and high-energy

paricles, celestail and

atmospheric and more

materials that let light throught are air, water and glass but ones that dont let any light are wood, bricks chalk boreds and walls.

shawdows are made when

you block the light rays that

are traviling in a straight line.

the position your in is the how

you make a shape or the size

of it.

foil, black paper, mirrors,

plastic sandwiches,metal,

waxed paper and smooth

and shiny objects and a

lot more can reflect light.