When the lens is pressed against the glass plate, the complex fluid is pushed aside at the point of pressure leaving a viod there. As seen in Fig-1c with Sodium light and Fig-1d with white light.

Fig-1c.

Fig-1d.

Some times traces of compressed fluid are found adhering to the projections on the surface of the glass plate as in Fig-1e for Sodium light and Fig-1f for white light. 

 

In the annular portions around the pressure point, the density of the complex fluid increases giving rise to broader fringes..

Fig-1e.

Fig-1f.

When a coverslip (thin glass plate) is pressed between the lens and the glass plate, the complex fluid at the pressure point is pushed away giving rise to two types of fringe patterns criss crossing each other Fig-1g  and  Fig-1h  with Sodium and white light respectively.

 

Fig-1g.

Fig-1h.

When a different sample of coverslip (thin glass plate) is pressed between the lens and the glass plate, the complex fluid at the pressure point is pushed away giving rise to two types of fringe patterns criss crossing each other  Fig-1g1  and   Fig-1h1  with Sodium and white light respectively.

One pattern is formed in the complex fluid between the lens and the coverslip and the other pattern is formed  in the complex fluid between the coverslip and the glass plate below. The Newton's rings between the lens and glass plate get bent at the edge of the coverslip and appear that their progress is hindered by the edge of the coverslip..

Fig-1g1.

Fig-1h1.

When the coverslip is placed on the plane glass plate and pressure is exerted, the complex fluid between the plates gets compressed and gets accumulated in pockets. Each pocket has its own fringe pattern as shown in Fig-1i  and Fig-1j  for Sodium light and white light respectively.

Fig-1i.

Fig-1j.

When a different sample of coverslip is placed on the plane glass plate and pressure is exerted, the complex fluid between the plates gets compressed and gets accumulated in pockets. Each pocket has its own fringe pattern as shown in Fig-1i1  and Fig-1j1 for Sodium light and white light respectively.

Fig-1i1.

Fig-1j1.

When two pieces of human hair are placed in a criss cross position and pressed between the lens and the glass plate, four quardrants are formed in the complex fluid giving rise to four sets of distorted Newton's rings in the four quardrants as shown in Fig-1m and Fig-1n for Sodium light and white light respectively.

Fig-1m.

Fig-1n.

That the fringe pattern exists only in the fluid layer/complex fluid is demonstrated in the following experiment. A piece of coverslip is placed between the lens and the coverslip and pressure is exerted. As the pressure is exerted the complex fluid between the coverslip and the glass plate gets pushed away leaving a void at the pressure point and the orientation of the fringes under goes change from vertical to horizontal. As the pressure is eased, the complex fluid flows back into the void covering it completely and the fringes get repositioned and revert to the original state. The fringes are always present in the fluid/complex fluid portion only as shown in the video clip-1a.