I’m not sure if its correct but I think it’s focal Ray point
For concave mirrors, some generalizations can be made to simplify ray construction. They are: An incident ray traveling parallel to the principal axis will reflect and pass through the focal point. An incident ray traveling through the focal point will reflect and travel parallel to the principal axis.
Had to look for the options and here is my answer.
These white lights can be actually found in MID-CHANNEL MARKERS kind of bouys. Buoys are actually necessary because they aid in navigation and these come in different colors and each differ in meaning. Hope this answer helps.
If you think more specifically about energy,such as thermal energy,the amount of that energy a substance has is determined by the movement of the molecules.hope this helps u