Yes, infrared belongs to light waves. When light waves strike the surface of most objects, they will diffuse, and the reflected light will spread in all directions, so the receiver that is not within the scope of specular reflection will also receive the light. Like a beam of light in the dark. You can't see the mirror unless it is within the reflection range of the mirror, but you can see other objects. But if the remote control is electromagnetic wave, it will be different, because electromagnetic wave propagation does not need medium.