noun
Usage: usually capitalized F
: two plane mirrors hinged so that there is no gap between the edges and so that the two planes make an angle with each other of nearly 180 degrees and used in demonstrating interference phenomena
noun
Usage: usually capitalized F
: two plane mirrors hinged so that there is no gap between the edges and so that the two planes make an angle with each other of nearly 180 degrees and used in demonstrating interference phenomena
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012