biprism
雙稜鏡; 雙稜柱體
Bi·prism n.
1. A prism whose refracting angle is very nearly 180 degrees.
2. A combination of two short rectangular glass prisms cemented together at their diagonal faces so as to form a cube; -- called also optical cube. It is used in one form of photometer.
◄ ►
biprism
n : an optical device for obtaining interference fringes