Question

Why should two interfering waves superpose at a grazing angle?

Answer 1

Hey mate ^_^

In interference there must be an angular separation between the incident waves so that a path difference exists to form interference patterns. The angle doesn’t necessarily is grazing angle. 

#Be Brainly♥️

Answer 2

$hello \: frnd \:$


In Interference there must be an angular separation between the accident waves so that path difference  exists to form interference patterns. The angle doesn’t necessarily is grazing angle. However, in X ray spectroscopy and atomic optics incident rays are kept at grazing angle for obtaining significant reflections.