Thank you so much for that.

May we ask permission to use EJS similar to the ray diagrams you've created as a device in an annual science competition in the Philippines if ever we would be able to get to the division, regionals and nationals? Our program is a little different because some lines in our ray diagrams are not shown there and we've also added its functions namely, concave, convex, double concave ad double convex.

Thank you very much!