Dioptre power of an concave lens of 10 cm focal length is_______________?A. 10 dioptreB. 10 dioptreC. 1 / 10 dioptreD. 1 / 10 dioptre 0 0 votesArticle Rating Subscribe LoginNotify of new follow-up commentsnew replies to my comments Label {} [+] Name* Email* Website Label {} [+] Name* Email* Website 0 Comments Oldest Newest Most Voted Inline FeedbacksView all comments