In recent years, dichroic polaroids have been widely used to produce polarized light. Their advantages are their comparative cheapness, small thickness, large linear and angular aperture. The main disadvantages are the following. Transmission is selective across the spectrum, as a result of which the spectral distribution of energy in the studied light stream is significantly distorted...

In recent years, new photographic emulsions and other photosensitive materials for holography have been developed with resolutions ranging from hundreds to several thousand lines per millimeter. New methods and appropriate instruments were required for the resolvometric testing of such emulsions, since projection resolvometers are unsuitable for testing at spatial frequencies above 600-1000 lines per millimeter...