By M. Francon

Manhattan 1979 1st educational. Translated by way of Henri Arsenault. 8vo, 161pp., hardcover. reliable, remnants of sq. white label on entrance board, internal hinges cracked. no dj.

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Sample text

A screen Ε with a small aperture Τ is put in the focal plane of the lens 0. The incident beam is a thin (narrow) bundle of rays that passes through the aperture T; only one of the incident rays, the ray SI, is shown in Fig. 41. The principal axis of the lens Ο is perpendicular to the plate L. The arbitrary incident ray SI is scattered at / either before or after being reflected on the interior face of plate L. Just as in Figs. 39 and 40, the two rays that interfere are rays IHIM' and IJKK' scattered from the same point / of surface AB.

The ground glass is assumed to be infinitely thin and in the plane of aperture T. Consider an incident ray SI that strikes the edge / of aperture Τ and that is diffracted along IM. The path difference Δ between ray SIM and ray SCM is the maximum path difference corre­ sponding to aperture Τ in the absence of the diffuser. Let a be the radius of aperture Τ and d be the distance from source S to aperture T. 4) where A G is the path difference introduced by the ground glass between points / and C.

These are photographs of speckle patterns. In the experiment corresponding to Fig. 46, two photographs of the same speckle pattern were used, that is, two identical diffusers. This time, two different diffusers Gj and G 2 are used. They are illuminated with a collimated beam, and the diffraction pattern is observed in the focal plane of lens Ο (Fig. 52). At the focal point F there is an image of the source that Fig. 52 Interference fringes produced in the focal plane of lens Ο by two axially shifted diffusers G x and G2 .

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