Reflected rings from the chair leg

[Adel Makram]

This is a pic of sun rays

shining on the metallic leg of the chair. The reflection comes on the floor of my room as rings. The source is just a square window. No other light sources in the room aside from reflection from the walls. The leg of the chair is cylinder in shape with smooth surface.
I am wondering what causes those rings?

 

[CWatters]

I suspect magnification of small ripples in the surface of the tubes.

 

[anorlunda]

Neat picture. I'm pretty sure they are interference rings. In this case, they are called Newton's Rings. See https://en.wikipedia.org/wiki/Newton's_rings

 

[berkeman]

Yes, cool picture.

See https://en.wikipedia.org/wiki/Newton's_rings

When viewed with white light, it forms a concentric ring pattern of rainbow colors, because the different wavelengths of light interfere at different thicknesses of the air layer between the surfaces.

@Adel Makram -- It's hard to see in your picture, but if you look closely, do you see the color separation that the Wikipedia article mentions?

 

[Adel Makram]

Yes, cool picture. @Adel Makram -- It's hard to see in your picture, but if you look closely, do you see the color separation that the Wikipedia article mentions?

The color of the carpet is blue but I could not see any colors at all. Also, to be honest, this is not the separation distance seen in the soap bubbles described in Newton lines assuming the interference pattern. Also, the surface of the chair tubes is entirely smooth with no ripples.

 

[Meir Achuz]

There could be a coating of wax on the metal leg. This would cause rings due to interference between the two reflections.

 

[Bystander]

'Pears to be "centered" on the "bend" in the leg.