[单选题]
In order to produce a holnm /h.2z+po z o25vuvgogram, one:dfzxzl * k28v50 exrg needs, in addition to an object and a piece of photoge2z lz 8kgv*5xrfx0d:raphic film,
A. a beam of monochromatic light and a mirror.
B. a beam of monochromatic light and a lens.
C. a beam of coherent light and a lens.
D. a beam of coherent light and a mirror.
Post time 2024-1-22 00:52:27