BS IS0 15368:2021 BSl Standards Publication Optics and photonics Measurement of reflectance of plane surfaces and transmittance of plane parallel elements bsi. BSISO15368:2021 BRITISH STANDARD National foreword This British Standard is the UK implementation of IS015368:2021. It supersedes BS IS0 15368:2001, which is withdrawn. TheUKparticipationinitspreparation was entrustedtoTechnical Committee CPW/172,Optics andPhotonics. A list of organizations represented on this committee can be obtained on requestto its committee manager. Contractual andlegalconsiderations This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will bemade, and no responsibility or liability is or will be reasonableness of this publication. All and any such responsibility and liability is expresslydisclaimed tothe full extent permitted by the law. This publication is provided as is, and is to be used at the recipient's own risk. The recipient is advised to consider seeking professional guidance with respectto itsuse ofthispublication. This publication is not intended to constitute a contract. Users are responsible for its correctapplication. @TheBritishStandardsInstitution2021 Published byBSI Standards Limited 2021 ISBN9780580965609 ICS17.180.01; 37.020 Compliancewith a British Standard cannot confer immunityfrom legal obligations. This British Standard was published under the authority of the StandardsPolicyandStrategyCommitteeon30April2021. Amendments/corrigenda issued sincepublication Date Textaffected BS ISO 15368:2021 ISO INTERNATIONAL STANDARD 15368 Second edition 2021-03-26 Optics and photonics Measurement of reflectance of plane surfaces and transmittance of plane parallel elements Optique etphotonique-Mesuragedufacteurde réflexion des surfaces planes et dufacteurdetransmission des élementsa plan parallele Reference number ISO 15368:2021(E) ISO @ ISO 2021