noun
reflector; reflecting mirror
A mirror or device that reflects light, heat, or other radiation. Used in optics, telescopes, lamps, and similar contexts.
天体望遠鏡には大きな反射鏡が使われている。
A large reflecting mirror is used in astronomical telescopes.
懐中電灯の反射鏡が光を集める。
The flashlight's reflector gathers the light.
反射板 is a flat reflective plate or panel, while 反射鏡 typically implies a curved or mirror-like surface for focusing.
Compound of 反射 (reflection) + 鏡 (mirror). The term is transparently derived from its components.