回光镜

concave reflector (e.g. in spotlight)

to circle / to go back / to turn around / to answer / to return / to revolve / Hui ethnic group (Chinese Muslims) / time / classifier for acts of a play / section or chapter (of a classic book)

to curve / to return / to revolve

variant of 迴|回[hui2]

light / ray / CL:道[dao4] / bright / only / merely / to use up

mirror / lens