>>4229004 lb
Only the light reflecting from the mirror is polarized. Get your polarized sunglasses and tilt your head.
https://www.photonics.com/Article.aspx?AID=35808
https://www.physicsclassroom.com/Class/light/U12L1e.cfm
https://physics.stackexchange.com/questions/233746/why-is-reflected-light-polarised