light rays pass through air & sound top try through a plastic door ->  light rays pass through air and a glass window  glass is a kind of material & a door is made of plastic -> a glass in a glass window is a kind of material a glass in a glass window is a kind of material  a glass in a glass window is a kind of material & land is a mean of spiritual -> air and a glass in a glass window are kinds of material air and a glass in a glass window are kinds of material  sound first try through land and a plastic door & air and a glass in a glass window are kinds of material -> light rays passes from the material air through the material glass when it pass through a glass window light rays passes from the material air through the material glass when it pass through a glass window  large is made of a mean of spiritual & refraction is when light passes from one medium to another medium -> refraction is when light passes from one material to another material refraction is when light passes from one material to another material  light rays passes from the material air through the material glass when it pass through a glass window & respiration is when sound place from zero spiritual to another spiritual -> the light rays will refract when they pass through a glass window