File talk:Lens shapes.svg

Incorrect sign for r₁ in Figure 8?

I believe the sign in parentheses for r₁ in Figure 8 is incorrect. I believe it should be labeled as "r₁ (+)". I would change it, but I'm unfamiliar with how to edit the SVG file. Sbb (留言) 14:09, 12 July 2019 (UTC)