The fluid layer is also found adhering to liquid surface and it is brought out in the following experiment.
A doughnut shaped oil film is formed over the glass plate and the lens is placed just above the oil film without actually touching the oil film. Normal Newton's rings are formed on the glass plate and the distorted Newton's rings pattern is seen on the oil film as shown in figure Fig-1o and Fig-1p with Sodium light and white light respectively.
The pattern on the oil film is owing to the combination of the fluid layer on the lens and that of the fluid layer on the oil surface giving rise to complex fluid. A Newton's rings pattern can be seen on water surface, if a watch glass is palced just 1/4 of a mm above the water surface with the convex surface facing the water surface.