Lenders don't give you credit for what you are currently earning. They average your income from those sources over the last two years, then add that to your regular salary or hourly monthly income. If you want a shortcut that is usually close, get out your W2 forms for the last two years.
Mirror is simply made by taking a slab of plane glass then coating it on one planar side with a coating of silver which provides the reflecting part, but due to corrosive nture of silver the same side is coated with a layer of anti-corrosive paint to protect layer of mirror.
The larger mirror also means the James Webb Space Telescope (JWST) will have excellent resolution. That's why the telescope's mirror is made up of 18 mirror segments that form a total area of 25 square-meters (almost 30 square yards) when they all come together.