What happens to infrared radiation when it comes to contact wih a shiny suface

If you didn't know, some surfaces are better than others at absorbing and reflecting infrared radiation.If infrared radiation comes in contact with a shiny surface the shiny surface reflects the radiation.(shiny surfaces are the best reflectors). Hope this helps you :D

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.