Traditional Culture Encyclopedia - Photography and portraiture - What is the principle of anti-counterfeiting method?

What is the principle of anti-counterfeiting method?

Sham's Law: When the extension plane of the object plane, the image plane and the lens plane intersect into a straight line, a comprehensive and clear image can be obtained.

Inverse Sham's Law: When the plane of the object, the plane of the image and the extended plane of the lens do not intersect, a clear image (a specific point, not an adjective) can be obtained.