User talk:14.195.236.83

June 2019
Please do not introduce incorrect information into articles, as you did to Geometrical optics. Your edits could be interpreted as vandalism and have been reverted. If you believe the information you added was correct, please cite references or sources or discuss the changes on the article's talk page before making them again. If you would like to experiment, use the sandbox. Thank you. — Lauritz Thomsen (talk) 07:06, 18 June 2019 (UTC)
 * If this is a shared IP address, and you did not make the edits referred to above, consider creating an account for yourself or logging in with an existing account so that you can avoid further irrelevant notices.