Why are Newton's rings circular in shape?

[Mannu136]

Hi...
Having problen in understanding Newton's ring experiment ?
And why are rings circular in shaoe ?
Thanks in advance...:)

 

[tiny-tim]

Welcome to PF!

Hi Mannu136! Welcome to PF!

Why would they be any other shape than circular, if the lens you start with is circular?

Give us a link to the text you're studying (or copy it),

and tell us which part you don't understand, so that we can explain that part. ​