Analysis of information sources in references of the Wikipedia article "Stationary-action principle" in English language version.
In Catoptrics the law of reflection is stated, namely that incoming and outgoing rays form the same angle with the surface normal.
In Catoptrics the law of reflection is stated, namely that incoming and outgoing rays form the same angle with the surface normal.
In Catoptrics the law of reflection is stated, namely that incoming and outgoing rays form the same angle with the surface normal.