1. A method for the inspection of an optical object for the existence therein of inhomogeneities, said method comprising providing a beam of inspection radiation and directing said beam on said optical object so that each point thereof is illuminated at a single respective angle; projecting said beam through said optical object on a projection screen and obtaining thereby a shadow pattern thereof, said optical inhomogeneities being distinguishable in said shadow pattern owing to a difference in the brightness of the areas corresponding thereto over the background brightness of the pattern; imaging said shadow pattern through said optical object in such a manner that the rays forming said image pass through each point of the optical object at an angle corresponding to said angle at which said point is illuminated; and detecting and analyzing said image of the shadow pattern.