Additional Interference Fringes Produced by Scattering and Reflexion

IN a recent observation, F. K. Bauchwitz and D. Shoenberg have reported observing a new interference effect. With the eye accommodated for infinity, they observed coloured circular fringes when looking at a strong point source through a thin air-film formed between silvered plates. The interpretation they give is that the light is first multiply reflected between the surfaces and then scattered, and this scattered light is multiply reflected before being observed.