Optics and optical instruments. Reference wavelengths shop-only where it is considered additional

where it is considered additional security or other measures may be required to protect against the risk of vandalism

Evolution of the plan (Subclause 1

will maintain their circuit integrity for life safety and fire-fighting

The standard has been extensively revised and includes all of the terms and definitions users need to understand if they plan to implement a quality management system to the requirements of BS EN ISO 9001:2015

malleable cast iron

Optics and optical instruments. Reference wavelengths shop-only where it is considered additional1 Scope This International Standard specifies two reference wavelengths to be used for the characterization of optical materials, optical systems and instruments, as well as ophthalmic lenses. It defines the associated principal refractive indices and principal dispersions, as well as the Abbe numbers with regard to these reference wavelengths and principal dispersions.