Blonde Girl Shows Herself In The Mirror

Hot mirrors reflect infrared light while allowing visible light to pass. These can be used to separate useful light from unneeded infrared to reduce heating of components in an optical device. They can also be used as dichroic beamsplitters. (Hot mirrors are the converse of cold mirrors.)
Metallic reflectors are used to reflect infrared light (such as in space heaters), or microwaves).
Non-reversing mirrors are mirrors that provide a non-reversed image of their subjects.
X-ray mirrors produce specular reflection of X-rays. All known types work only at angles near grazing incidence, and only a small fraction of the rays are reflected.