optics - Some doubts related to interference of light by air wedge - Physics Stack Exchange

We were taught "Interference by an Air Wedge" today in class. I have attached the image of diagram we were taught and the related formulae. However, I have still some lingering doubts about this to

2nd semester 3rd class a optics lab exam 2013

Chapter 27, Example #5 (Air Wedge)

Solved a. 7. The interference pattern created by

3. As shown in the figure, an air wedge is used to measure the diameter of the thin wire. If l =589.3 nm, L = 2.888X10-2 m, the general width of 30

optics - How are thin film interference patterns observed? - Physics Stack Exchange

Exciton–Photonics: From Fundamental Science to Applications

JETP Letters

Explain how interference fringes are formed in an air wedge. - Digital Teachers Uganda

optics - Which are the rays that form the fringes in wedge shaped film and Newton's rings? - Physics Stack Exchange

Class 12 Physics, Interference, #46 Interference by an Air Wedge