鏡

bathroom mirror; make-up mirror

gastroscope

plane mirror

eyepiece; ocular lens

breaking open a ceremonial sake barrel

cloud mirror; mirror nephoscope; reflecting nephoscope

traditional mirror with a handle, popular since the Muromachi period

Japanese-style mirror

prism

Mathematics

reflection

primary mirror (of a telescope); main mirror

Chemistry

enantiomer

spherical mirror

water glass; hydroscope; box, etc. with glass bottom for viewing underwater

spectacled bear (Tremarctos ornatus)

speculum (bright patch on the wings of ducks)

bagua mirror (mirror used in divination in fengshui); pa kua mirror

one-way mirror

concave glasses

convex mirror

stereoscope

spectacled cobra; Indian cobra; Asian cobra (Naja naja)

Metaplexis japonica

helioscope