Light reflection demonstration instrument

The utility model discloses a light reflex demonstrator: a normal line laser launch device which comprises a cabinet base, a normal line laser emitter and a reflector, wherein the normal line laser emitter and the reflector are arranged on the cabinet base, the normal line laser emitter is fixed under the reflecting layer of the reflector, the reflecting layer of the reflector is scraped off a spot shaped part, the light beam from the normal line laser emitter passes through the reflector without the spot shaped reflecting layer part and perpendicular to the surface of the reflector to form a normal line light beam; a incidence laser launching device comprises a support and a incidence laser launching apparatus, the incidence laser launching apparatus is arranged on the support, the support is arranged on the cabinet base of the normal line laser launching device, and the incidence point of the incidence light beam sent out from the incidence laser launching apparatus is at the position of the reflector after