ABSTRACT
T Talbot’s Law A slowly flickering light source can be detected by the eye. However, due to the finite response time of the eye, this flicker cannot be detected above a critical frequency, This principle is known as Talbot’s Law and can be demonstrated quantitatively by a rotating sector wheel. Above the critical frequency of rotation of the wheel, the intensity of transmitted light varies as the proportion of sectors cut from the wheel. Talbot’s Law finds application in motion pictures, where for practical purposes blurring is prevented by projection at 24 frames per second.
tangent law Assuming that there is no spherical aberration of the principal rays from the object points, the condition to be satisfied for elimination of distortion for a Gaussian image is
