Function: noun
Date: 1935
: a mirror or prism or a combination of the two that is used to divide a beam of radiation into two or more parts
Function: noun
Date: 1935
: a mirror or prism or a combination of the two that is used to divide a beam of radiation into two or more parts
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012