Show it xray X ray reflectors R mica has been found an excellent S material for concentrating mirrors for S X rays raya glass class will not do because smooth as it Is it Is too rough tor for the extremely minute X rays which are vs much smaller e than an light g waves alasi as p diffuses the X rays much ns as a rough f surface diffuses light waves but it was found that the surface of mineral I 1 crys y were of th ohp p requisite smoothness for reflecting X rays and of them mica ls Is the most adaptable being readily split into sheets |