Rao VR, Mehta KR, Joshi BC. A simple non destructive method for the determination of the refractive indices of finished lenses. Def. Sc. J. [Internet]. 2014 May 13 [cited 2025 Jun. 16];12(3):253-5. Available from: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/7190