is and is not a homogeneous material: • A plastic cover is a homogeneous material if it consists of one type of plastic that is not coated with other materi...

https://www.apple.com/jp/environment/pdf/Apple_Regulated_Substances_Specification_Sept2018.pdf

to as a batwing lens because of its shape) further bends the light from the LED. 3. An Apple-designed cavity reflector made of plastic film is layered on to...

https://www.apple.com/jp/pro-display-xdr/pdf/Pro_Display_White_Paper_Feb_2020.pdf