What material lets light pass through it freeley

Materials

  A variety of transparent objects, such as reading glasses, plastic wrap, light bulb (if you can see the filament inside clearly), plastic transparency, and water   A variety of translucent objects, such as sunglasses, notebook paper, wax paper, stained glass, a lampshade, and vegetable oil   A variety of opaque objects, such as a book, aluminum paper, upholstery fabric, and spoons   Science journals or loose leaf paperHope this helps youXD

Empty space like when the light from the sun reaches us

Alkaline earth metals are found in group 2 of the periodic table.