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ISO/WD 21395-1

Optics and photonics — Test method for refractive index of optical glasses — Part 1: Minimum deviation method

General information

20.60     Apr 17, 2026

ISO

ISO/TC 172/SC 3

International Standard

Scope

This document specifies the measuring method for the refractive index of optical glasses with the accuracy within 1 × 10−5 used in the spectral range from 365 nm to 2 400 nm.
Additional information on how to apply the refractive index in the dispersion and the various dispersion formulae of optical glasses is given in Annex A and Annex B.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 21395-1:2020

NOW

PROJECT
ISO/WD 21395-1
20.60 Close of comment period
Apr 17, 2026