Question

What is the obliquity factor?

Answer 1

Obliquity factor:

1. According to Huygens' principle, the obliquity factor is a function. It is a function that is proportional to the amplitudes of secondary waves.
2. In the form of equation the obliquity factor is proportional to $1+\cos \theta$.
3. Here $\theta$ denotes the angle between the normal to the original wavefront and normal to the secondary wavefront.