File talk:Half lens.svg
The blue dashed line that is supposed to be the normal to the first surface is way off of normal. To my eye that makes this diagram unusable.--Srleffler (talk) 17:59, 2 July 2023 (UTC)
The blue dashed line that is supposed to be the normal to the first surface is way off of normal. To my eye that makes this diagram unusable.--Srleffler (talk) 17:59, 2 July 2023 (UTC)[reply]
