Young's Double Slit Experiment: Angle between incoming waves

Question

Consider the experimental setup for Young's Double Slit Experiment:

Here there is an angle between the directions of propagation of waves ,i.e., $angle S_1PS_2$ - the angle between the electric and magnetic field vectors at that point other than the phase difference.
My question is:
Why is this angle never taken into account while analysing this experiment or the diffraction experiments?

Source of the image: https://www.embibe.com/study/effect-of-placing-thin-transparent-film-in-ydse-in-front-of-slits-concept

Ali · Accepted Answer

Typically we assume that the distance to the screen is much larger than the width of the slits or the separation of the slits. The light that emerges from the two slits at an angle of theta are almost parallel. Thus, theoretically and approximately there is no angle $S_1 P S_2$.

Correct answer by Ali on June 30, 2021

Young's Double Slit Experiment: Angle between incoming waves

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