Bilinsa Billet

Bilins Billet , Lens Billet - a collecting lens , cut in half in diameter, both halves of which are moved apart. The slot is closed by an opaque screen.

The light from the slit S parallel to the cut plane is directed to the biline. At points S1 and S2 , actual images of the slit S are obtained. The rays passing through them further overlap (the shaded area in the figure), forming an interference pattern.

The experiments on obtaining an interference pattern using the Billet lens are similar to the Jung Experience , the differences are only in the way the secondary sources are formed.

If you change the nature of the shift of the halves of the bilinza from the perpendicular optical axis to an offset along it, then the appearance of the interference pattern will change. This arrangement of lens parts is used in the Meslin Experience .

The setup scheme does not differ in high aperture, and for demonstration the experience with the Billet biline lens, as well as with the biprism and Fresnel bisercal, is of little use ^[1] .