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Evolution of the plan (Subclause 1
This standard applies to test pieces taken from metallic products
Editorial change to harmonize the text with other standards in this series
BS 4142 is used to assess the impact of industrial and commercial sound
malleable cast iron
Optics and optical instruments. Reference wavelengths shop-only Evolution of the plan (Subclause1 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.
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